diff --git a/poetry.lock b/poetry.lock
index e7cb490..e20386a 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -10,15 +10,15 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 name = "attrs"
 version = "21.4.0"
 description = "Classes Without Boilerplate"
-category = "dev"
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [package.extras]
-dev = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "mypy", "pytest-mypy-plugins", "zope.interface", "furo", "sphinx", "sphinx-notfound-page", "pre-commit", "cloudpickle"]
-docs = ["furo", "sphinx", "zope.interface", "sphinx-notfound-page"]
-tests = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "mypy", "pytest-mypy-plugins", "zope.interface", "cloudpickle"]
-tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "mypy", "pytest-mypy-plugins", "cloudpickle"]
+dev = ["cloudpickle", "coverage[toml] (>=5.0.2)", "furo", "hypothesis", "mypy", "pre-commit", "pympler", "pytest (>=4.3.0)", "pytest-mypy-plugins", "six", "sphinx", "sphinx-notfound-page", "zope.interface"]
+docs = ["furo", "sphinx", "sphinx-notfound-page", "zope.interface"]
+tests = ["cloudpickle", "coverage[toml] (>=5.0.2)", "hypothesis", "mypy", "pympler", "pytest (>=4.3.0)", "pytest-mypy-plugins", "six", "zope.interface"]
+tests_no_zope = ["cloudpickle", "coverage[toml] (>=5.0.2)", "hypothesis", "mypy", "pympler", "pytest (>=4.3.0)", "pytest-mypy-plugins", "six"]
 
 [[package]]
 name = "cachecontrol"
@@ -46,8 +46,8 @@ optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [package.extras]
-msgpack = ["msgpack-python (>=0.5,<0.6)"]
 memcached = ["python-memcached (>=1.59,<2.0)"]
+msgpack = ["msgpack-python (>=0.5,<0.6)"]
 redis = ["redis (>=3.3.6,<4.0.0)"]
 
 [[package]]
@@ -128,12 +128,12 @@ python-versions = ">=3.6"
 cffi = ">=1.12"
 
 [package.extras]
-docs = ["sphinx (>=1.6.5,!=1.8.0,!=3.1.0,!=3.1.1)", "sphinx-rtd-theme"]
-docstest = ["pyenchant (>=1.6.11)", "twine (>=1.12.0)", "sphinxcontrib-spelling (>=4.0.1)"]
+docs = ["sphinx (>=1.6.5,!=1.8.0,!=3.1.0,!=3.1.1)", "sphinx_rtd_theme"]
+docstest = ["pyenchant (>=1.6.11)", "sphinxcontrib-spelling (>=4.0.1)", "twine (>=1.12.0)"]
 pep8test = ["black", "flake8", "flake8-import-order", "pep8-naming"]
 sdist = ["setuptools_rust (>=0.11.4)"]
 ssh = ["bcrypt (>=3.1.5)"]
-test = ["pytest (>=6.2.0)", "pytest-benchmark", "pytest-cov", "pytest-subtests", "pytest-xdist", "pretend", "iso8601", "pytz", "hypothesis (>=1.11.4,!=3.79.2)"]
+test = ["hypothesis (>=1.11.4,!=3.79.2)", "iso8601", "pretend", "pytest (>=6.2.0)", "pytest-benchmark", "pytest-cov", "pytest-subtests", "pytest-xdist", "pytz"]
 
 [[package]]
 name = "distlib"
@@ -186,10 +186,10 @@ six = ">=1.9"
 webencodings = "*"
 
 [package.extras]
-lxml = ["lxml"]
-genshi = ["genshi"]
+all = ["chardet (>=2.2)", "genshi", "lxml"]
 chardet = ["chardet (>=2.2)"]
-all = ["lxml", "chardet (>=2.2)", "genshi"]
+genshi = ["genshi"]
+lxml = ["lxml"]
 
 [[package]]
 name = "identify"
@@ -223,9 +223,24 @@ typing-extensions = {version = ">=3.6.4", markers = "python_version < \"3.8\""}
 zipp = ">=0.5"
 
 [package.extras]
-docs = ["sphinx", "jaraco.packaging (>=9)", "rst.linker (>=1.9)"]
+docs = ["jaraco.packaging (>=9)", "rst.linker (>=1.9)", "sphinx"]
 perf = ["ipython"]
-testing = ["pytest (>=6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-cov", "pytest-enabler (>=1.0.1)", "packaging", "pyfakefs", "flufl.flake8", "pytest-perf (>=0.9.2)", "pytest-black (>=0.3.7)", "pytest-mypy (>=0.9.1)", "importlib-resources (>=1.3)"]
+testing = ["flufl.flake8", "importlib-resources (>=1.3)", "packaging", "pyfakefs", "pytest (>=6)", "pytest-black (>=0.3.7)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=1.0.1)", "pytest-flake8", "pytest-mypy (>=0.9.1)", "pytest-perf (>=0.9.2)"]
+
+[[package]]
+name = "importlib-resources"
+version = "5.9.0"
+description = "Read resources from Python packages"
+category = "main"
+optional = false
+python-versions = ">=3.7"
+
+[package.dependencies]
+zipp = {version = ">=3.1.0", markers = "python_version < \"3.10\""}
+
+[package.extras]
+docs = ["jaraco.packaging (>=9)", "jaraco.tidelift (>=1.4)", "rst.linker (>=1.9)", "sphinx"]
+testing = ["pytest (>=6)", "pytest-black (>=0.3.7)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=1.3)", "pytest-flake8", "pytest-mypy (>=0.9.1)"]
 
 [[package]]
 name = "iniconfig"
@@ -244,8 +259,28 @@ optional = false
 python-versions = ">=3.7"
 
 [package.extras]
-trio = ["async-generator", "trio"]
-test = ["async-timeout", "trio", "testpath", "pytest-asyncio (>=0.17)", "pytest-trio", "pytest"]
+test = ["async-timeout", "pytest", "pytest-asyncio (>=0.17)", "pytest-trio", "testpath", "trio"]
+trio = ["async_generator", "trio"]
+
+[[package]]
+name = "jsonschema"
+version = "4.16.0"
+description = "An implementation of JSON Schema validation for Python"
+category = "main"
+optional = false
+python-versions = ">=3.7"
+
+[package.dependencies]
+attrs = ">=17.4.0"
+importlib-metadata = {version = "*", markers = "python_version < \"3.8\""}
+importlib-resources = {version = ">=1.4.0", markers = "python_version < \"3.9\""}
+pkgutil-resolve-name = {version = ">=1.3.10", markers = "python_version < \"3.9\""}
+pyrsistent = ">=0.14.0,<0.17.0 || >0.17.0,<0.17.1 || >0.17.1,<0.17.2 || >0.17.2"
+typing-extensions = {version = "*", markers = "python_version < \"3.8\""}
+
+[package.extras]
+format = ["fqdn", "idna", "isoduration", "jsonpointer (>1.13)", "rfc3339-validator", "rfc3987", "uri-template", "webcolors (>=1.11)"]
+format-nongpl = ["fqdn", "idna", "isoduration", "jsonpointer (>1.13)", "rfc3339-validator", "rfc3986-validator (>0.1.0)", "uri-template", "webcolors (>=1.11)"]
 
 [[package]]
 name = "keyring"
@@ -262,8 +297,8 @@ pywin32-ctypes = {version = "<0.1.0 || >0.1.0,<0.1.1 || >0.1.1", markers = "sys_
 SecretStorage = {version = ">=3.2", markers = "sys_platform == \"linux\""}
 
 [package.extras]
-docs = ["sphinx", "jaraco.packaging (>=9)", "rst.linker (>=1.9)", "jaraco.tidelift (>=1.4)"]
-testing = ["pytest (>=6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-cov", "pytest-enabler (>=1.0.1)", "pytest-black (>=0.3.7)", "pytest-mypy (>=0.9.1)"]
+docs = ["jaraco.packaging (>=9)", "jaraco.tidelift (>=1.4)", "rst.linker (>=1.9)", "sphinx"]
+testing = ["pytest (>=6)", "pytest-black (>=0.3.7)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=1.0.1)", "pytest-flake8", "pytest-mypy (>=0.9.1)"]
 
 [[package]]
 name = "lockfile"
@@ -349,6 +384,14 @@ python-versions = "*"
 [package.extras]
 testing = ["coverage", "nose"]
 
+[[package]]
+name = "pkgutil_resolve_name"
+version = "1.3.10"
+description = "Resolve a name to an object."
+category = "main"
+optional = false
+python-versions = ">=3.6"
+
 [[package]]
 name = "platformdirs"
 version = "2.5.2"
@@ -358,8 +401,8 @@ optional = false
 python-versions = ">=3.7"
 
 [package.extras]
-docs = ["furo (>=2021.7.5b38)", "proselint (>=0.10.2)", "sphinx-autodoc-typehints (>=1.12)", "sphinx (>=4)"]
-test = ["appdirs (==1.4.4)", "pytest-cov (>=2.7)", "pytest-mock (>=3.6)", "pytest (>=6)"]
+docs = ["furo (>=2021.7.5b38)", "proselint (>=0.10.2)", "sphinx (>=4)", "sphinx-autodoc-typehints (>=1.12)"]
+test = ["appdirs (==1.4.4)", "pytest (>=6)", "pytest-cov (>=2.7)", "pytest-mock (>=3.6)"]
 
 [[package]]
 name = "pluggy"
@@ -373,12 +416,12 @@ python-versions = ">=3.6"
 importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
 
 [package.extras]
-testing = ["pytest-benchmark", "pytest"]
-dev = ["tox", "pre-commit"]
+dev = ["pre-commit", "tox"]
+testing = ["pytest", "pytest-benchmark"]
 
 [[package]]
 name = "poetry"
-version = "1.2.0b3"
+version = "1.2.0"
 description = "Python dependency management and packaging made easy."
 category = "main"
 optional = false
@@ -392,24 +435,25 @@ crashtest = ">=0.3.0,<0.4.0"
 dulwich = ">=0.20.44,<0.21.0"
 html5lib = ">=1.0,<2.0"
 importlib-metadata = {version = ">=4.4,<5.0", markers = "python_version < \"3.10\""}
+jsonschema = ">=4.10.0,<5.0.0"
 keyring = ">=21.2.0"
 packaging = ">=20.4"
 pexpect = ">=4.7.0,<5.0.0"
 pkginfo = ">=1.5,<2.0"
 platformdirs = ">=2.5.2,<3.0.0"
-poetry-core = "1.1.0b3"
-poetry-plugin-export = ">=1.0.5,<2.0.0"
+poetry-core = "1.1.0"
+poetry-plugin-export = ">=1.0.6,<2.0.0"
 requests = ">=2.18,<3.0"
 requests-toolbelt = ">=0.9.1,<0.10.0"
-shellingham = ">=1.1,<2.0"
-tomlkit = ">=0.7.0,<1.0.0"
+shellingham = ">=1.5,<2.0"
+tomlkit = ">=0.11.1,<0.11.2 || >0.11.2,<0.11.3 || >0.11.3,<1.0.0"
 urllib3 = ">=1.26.0,<2.0.0"
 virtualenv = "*"
 xattr = {version = ">=0.9.7,<0.10.0", markers = "sys_platform == \"darwin\""}
 
 [[package]]
 name = "poetry-core"
-version = "1.1.0b3"
+version = "1.1.0"
 description = "Poetry PEP 517 Build Backend"
 category = "main"
 optional = false
@@ -476,7 +520,15 @@ optional = false
 python-versions = ">=3.6.8"
 
 [package.extras]
-diagrams = ["railroad-diagrams", "jinja2"]
+diagrams = ["jinja2", "railroad-diagrams"]
+
+[[package]]
+name = "pyrsistent"
+version = "0.18.1"
+description = "Persistent/Functional/Immutable data structures"
+category = "main"
+optional = false
+python-versions = ">=3.7"
 
 [[package]]
 name = "pytest"
@@ -512,7 +564,7 @@ python-versions = ">=3.7"
 pytest = ">=5.0"
 
 [package.extras]
-dev = ["pre-commit", "tox", "pytest-asyncio"]
+dev = ["pre-commit", "pytest-asyncio", "tox"]
 
 [[package]]
 name = "pywin32-ctypes"
@@ -573,11 +625,11 @@ jeepney = ">=0.6"
 
 [[package]]
 name = "shellingham"
-version = "1.4.0"
+version = "1.5.0"
 description = "Tool to Detect Surrounding Shell"
 category = "main"
 optional = false
-python-versions = "!=3.0,!=3.1,!=3.2,!=3.3,>=2.6"
+python-versions = ">=3.4"
 
 [[package]]
 name = "six"
@@ -605,7 +657,7 @@ python-versions = ">=3.7"
 
 [[package]]
 name = "tomlkit"
-version = "0.11.0"
+version = "0.11.4"
 description = "Style preserving TOML library"
 category = "main"
 optional = false
@@ -636,8 +688,8 @@ optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, <4"
 
 [package.extras]
-brotli = ["brotlicffi (>=0.8.0)", "brotli (>=1.0.9)", "brotlipy (>=0.6.0)"]
-secure = ["pyOpenSSL (>=0.14)", "cryptography (>=1.3.4)", "idna (>=2.0.0)", "certifi", "ipaddress"]
+brotli = ["brotli (>=1.0.9)", "brotlicffi (>=0.8.0)", "brotlipy (>=0.6.0)"]
+secure = ["certifi", "cryptography (>=1.3.4)", "idna (>=2.0.0)", "ipaddress", "pyOpenSSL (>=0.14)"]
 socks = ["PySocks (>=1.5.6,!=1.5.7,<2.0)"]
 
 [[package]]
@@ -657,7 +709,7 @@ six = ">=1.9.0,<2"
 
 [package.extras]
 docs = ["proselint (>=0.10.2)", "sphinx (>=3)", "sphinx-argparse (>=0.2.5)", "sphinx-rtd-theme (>=0.4.3)", "towncrier (>=21.3)"]
-testing = ["coverage (>=4)", "coverage-enable-subprocess (>=1)", "flaky (>=3)", "pytest (>=4)", "pytest-env (>=0.6.2)", "pytest-freezegun (>=0.4.1)", "pytest-mock (>=2)", "pytest-randomly (>=1)", "pytest-timeout (>=1)", "packaging (>=20.0)"]
+testing = ["coverage (>=4)", "coverage-enable-subprocess (>=1)", "flaky (>=3)", "packaging (>=20.0)", "pytest (>=4)", "pytest-env (>=0.6.2)", "pytest-freezegun (>=0.4.1)", "pytest-mock (>=2)", "pytest-randomly (>=1)", "pytest-timeout (>=1)"]
 
 [[package]]
 name = "webencodings"
@@ -687,13 +739,13 @@ optional = false
 python-versions = ">=3.7"
 
 [package.extras]
-docs = ["sphinx", "jaraco.packaging (>=9)", "rst.linker (>=1.9)"]
-testing = ["pytest (>=6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-cov", "pytest-enabler (>=1.0.1)", "jaraco.itertools", "func-timeout", "pytest-black (>=0.3.7)", "pytest-mypy (>=0.9.1)"]
+docs = ["jaraco.packaging (>=9)", "rst.linker (>=1.9)", "sphinx"]
+testing = ["func-timeout", "jaraco.itertools", "pytest (>=6)", "pytest-black (>=0.3.7)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=1.0.1)", "pytest-flake8", "pytest-mypy (>=0.9.1)"]
 
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.7"
-content-hash = "d2dc8653224ff8c0482b1a295e29ed597d2093af7930b60b2fbdc2dee1616973"
+content-hash = "16fb36bb93e571265e5f7486ed73396e89bf112f9454b59d51595be69e2c2ac6"
 
 [metadata.files]
 atomicwrites = [
@@ -859,6 +911,10 @@ importlib-metadata = [
     {file = "importlib_metadata-4.11.4-py3-none-any.whl", hash = "sha256:c58c8eb8a762858f49e18436ff552e83914778e50e9d2f1660535ffb364552ec"},
     {file = "importlib_metadata-4.11.4.tar.gz", hash = "sha256:5d26852efe48c0a32b0509ffbc583fda1a2266545a78d104a6f4aff3db17d700"},
 ]
+importlib-resources = [
+    {file = "importlib_resources-5.9.0-py3-none-any.whl", hash = "sha256:f78a8df21a79bcc30cfd400bdc38f314333de7c0fb619763f6b9dabab8268bb7"},
+    {file = "importlib_resources-5.9.0.tar.gz", hash = "sha256:5481e97fb45af8dcf2f798952625591c58fe599d0735d86b10f54de086a61681"},
+]
 iniconfig = [
     {file = "iniconfig-1.1.1-py2.py3-none-any.whl", hash = "sha256:011e24c64b7f47f6ebd835bb12a743f2fbe9a26d4cecaa7f53bc4f35ee9da8b3"},
     {file = "iniconfig-1.1.1.tar.gz", hash = "sha256:bc3af051d7d14b2ee5ef9969666def0cd1a000e121eaea580d4a313df4b37f32"},
@@ -867,6 +923,10 @@ jeepney = [
     {file = "jeepney-0.8.0-py3-none-any.whl", hash = "sha256:c0a454ad016ca575060802ee4d590dd912e35c122fa04e70306de3d076cce755"},
     {file = "jeepney-0.8.0.tar.gz", hash = "sha256:5efe48d255973902f6badc3ce55e2aa6c5c3b3bc642059ef3a91247bcfcc5806"},
 ]
+jsonschema = [
+    {file = "jsonschema-4.16.0-py3-none-any.whl", hash = "sha256:9e74b8f9738d6a946d70705dc692b74b5429cd0960d58e79ffecfc43b2221eb9"},
+    {file = "jsonschema-4.16.0.tar.gz", hash = "sha256:165059f076eff6971bae5b742fc029a7b4ef3f9bcf04c14e4776a7605de14b23"},
+]
 keyring = [
     {file = "keyring-23.5.1-py3-none-any.whl", hash = "sha256:9ef58314bcc823f426b49ec787539a2d73571b37de4cd498f839803b01acff1e"},
     {file = "keyring-23.5.1.tar.gz", hash = "sha256:dee502cdf18a98211bef428eea11456a33c00718b2f08524fd5727c7f424bffd"},
@@ -956,6 +1016,10 @@ pkginfo = [
     {file = "pkginfo-1.8.2-py2.py3-none-any.whl", hash = "sha256:c24c487c6a7f72c66e816ab1796b96ac6c3d14d49338293d2141664330b55ffc"},
     {file = "pkginfo-1.8.2.tar.gz", hash = "sha256:542e0d0b6750e2e21c20179803e40ab50598d8066d51097a0e382cba9eb02bff"},
 ]
+pkgutil_resolve_name = [
+    {file = "pkgutil_resolve_name-1.3.10-py3-none-any.whl", hash = "sha256:ca27cc078d25c5ad71a9de0a7a330146c4e014c2462d9af19c6b828280649c5e"},
+    {file = "pkgutil_resolve_name-1.3.10.tar.gz", hash = "sha256:357d6c9e6a755653cfd78893817c0853af365dd51ec97f3d358a819373bbd174"},
+]
 platformdirs = [
     {file = "platformdirs-2.5.2-py3-none-any.whl", hash = "sha256:027d8e83a2d7de06bbac4e5ef7e023c02b863d7ea5d079477e722bb41ab25788"},
     {file = "platformdirs-2.5.2.tar.gz", hash = "sha256:58c8abb07dcb441e6ee4b11d8df0ac856038f944ab98b7be6b27b2a3c7feef19"},
@@ -965,12 +1029,12 @@ pluggy = [
     {file = "pluggy-1.0.0.tar.gz", hash = "sha256:4224373bacce55f955a878bf9cfa763c1e360858e330072059e10bad68531159"},
 ]
 poetry = [
-    {file = "poetry-1.2.0b3-py3-none-any.whl", hash = "sha256:f97a44d6879c05f74c095c524cde2aa113355efc5513dd5a864f89126b74957c"},
-    {file = "poetry-1.2.0b3.tar.gz", hash = "sha256:f3d29486128fbfcece49390b5fb1f91a8f81c91f1b6eb131f15301984fba26ba"},
+    {file = "poetry-1.2.0-py3-none-any.whl", hash = "sha256:af99cad115cb0fbad8c41eb31c5a5dee25a9f6c74fc1d4d6dad8e51a69ebe348"},
+    {file = "poetry-1.2.0.tar.gz", hash = "sha256:17c527d5d5505a5a7c5c14348d87f077d643cf1f186321530cde68e530bba59f"},
 ]
 poetry-core = [
-    {file = "poetry-core-1.1.0b3.tar.gz", hash = "sha256:ea257bb0aab15008d1680cc221a46f3457a3b36f3d463736f552497f0b6b9350"},
-    {file = "poetry_core-1.1.0b3-py3-none-any.whl", hash = "sha256:2b65b697e22fc6fc9b60afcadfd4421db796d30d558a003654b5e67e3b262eaa"},
+    {file = "poetry-core-1.1.0.tar.gz", hash = "sha256:d145ae121cf79118a8901b60f2c951c4edcc16f55eb8aaefc156aa33aa921f07"},
+    {file = "poetry_core-1.1.0-py3-none-any.whl", hash = "sha256:da16a12054bf3f1ff8656d4c289f99c3d6b7704d272fb174004c4dc82e045954"},
 ]
 pre-commit = [
     {file = "pre_commit-2.19.0-py2.py3-none-any.whl", hash = "sha256:10c62741aa5704faea2ad69cb550ca78082efe5697d6f04e5710c3c229afdd10"},
@@ -996,6 +1060,29 @@ pyparsing = [
     {file = "pyparsing-3.0.9-py3-none-any.whl", hash = "sha256:5026bae9a10eeaefb61dab2f09052b9f4307d44aee4eda64b309723d8d206bbc"},
     {file = "pyparsing-3.0.9.tar.gz", hash = "sha256:2b020ecf7d21b687f219b71ecad3631f644a47f01403fa1d1036b0c6416d70fb"},
 ]
+pyrsistent = [
+    {file = "pyrsistent-0.18.1-cp310-cp310-macosx_10_9_universal2.whl", hash = "sha256:df46c854f490f81210870e509818b729db4488e1f30f2a1ce1698b2295a878d1"},
+    {file = "pyrsistent-0.18.1-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:5d45866ececf4a5fff8742c25722da6d4c9e180daa7b405dc0a2a2790d668c26"},
+    {file = "pyrsistent-0.18.1-cp310-cp310-manylinux_2_5_i686.manylinux1_i686.manylinux_2_17_i686.manylinux2014_i686.whl", hash = "sha256:4ed6784ceac462a7d6fcb7e9b663e93b9a6fb373b7f43594f9ff68875788e01e"},
+    {file = "pyrsistent-0.18.1-cp310-cp310-win32.whl", hash = "sha256:e4f3149fd5eb9b285d6bfb54d2e5173f6a116fe19172686797c056672689daf6"},
+    {file = "pyrsistent-0.18.1-cp310-cp310-win_amd64.whl", hash = "sha256:636ce2dc235046ccd3d8c56a7ad54e99d5c1cd0ef07d9ae847306c91d11b5fec"},
+    {file = "pyrsistent-0.18.1-cp37-cp37m-macosx_10_9_x86_64.whl", hash = "sha256:e92a52c166426efbe0d1ec1332ee9119b6d32fc1f0bbfd55d5c1088070e7fc1b"},
+    {file = "pyrsistent-0.18.1-cp37-cp37m-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:d7a096646eab884bf8bed965bad63ea327e0d0c38989fc83c5ea7b8a87037bfc"},
+    {file = "pyrsistent-0.18.1-cp37-cp37m-manylinux_2_5_i686.manylinux1_i686.manylinux_2_17_i686.manylinux2014_i686.whl", hash = "sha256:cdfd2c361b8a8e5d9499b9082b501c452ade8bbf42aef97ea04854f4a3f43b22"},
+    {file = "pyrsistent-0.18.1-cp37-cp37m-win32.whl", hash = "sha256:7ec335fc998faa4febe75cc5268a9eac0478b3f681602c1f27befaf2a1abe1d8"},
+    {file = "pyrsistent-0.18.1-cp37-cp37m-win_amd64.whl", hash = "sha256:6455fc599df93d1f60e1c5c4fe471499f08d190d57eca040c0ea182301321286"},
+    {file = "pyrsistent-0.18.1-cp38-cp38-macosx_10_9_universal2.whl", hash = "sha256:fd8da6d0124efa2f67d86fa70c851022f87c98e205f0594e1fae044e7119a5a6"},
+    {file = "pyrsistent-0.18.1-cp38-cp38-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:7bfe2388663fd18bd8ce7db2c91c7400bf3e1a9e8bd7d63bf7e77d39051b85ec"},
+    {file = "pyrsistent-0.18.1-cp38-cp38-manylinux_2_5_i686.manylinux1_i686.manylinux_2_17_i686.manylinux2014_i686.whl", hash = "sha256:0e3e1fcc45199df76053026a51cc59ab2ea3fc7c094c6627e93b7b44cdae2c8c"},
+    {file = "pyrsistent-0.18.1-cp38-cp38-win32.whl", hash = "sha256:b568f35ad53a7b07ed9b1b2bae09eb15cdd671a5ba5d2c66caee40dbf91c68ca"},
+    {file = "pyrsistent-0.18.1-cp38-cp38-win_amd64.whl", hash = "sha256:d1b96547410f76078eaf66d282ddca2e4baae8964364abb4f4dcdde855cd123a"},
+    {file = "pyrsistent-0.18.1-cp39-cp39-macosx_10_9_universal2.whl", hash = "sha256:f87cc2863ef33c709e237d4b5f4502a62a00fab450c9e020892e8e2ede5847f5"},
+    {file = "pyrsistent-0.18.1-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:6bc66318fb7ee012071b2792024564973ecc80e9522842eb4e17743604b5e045"},
+    {file = "pyrsistent-0.18.1-cp39-cp39-manylinux_2_5_i686.manylinux1_i686.manylinux_2_17_i686.manylinux2014_i686.whl", hash = "sha256:914474c9f1d93080338ace89cb2acee74f4f666fb0424896fcfb8d86058bf17c"},
+    {file = "pyrsistent-0.18.1-cp39-cp39-win32.whl", hash = "sha256:1b34eedd6812bf4d33814fca1b66005805d3640ce53140ab8bbb1e2651b0d9bc"},
+    {file = "pyrsistent-0.18.1-cp39-cp39-win_amd64.whl", hash = "sha256:e24a828f57e0c337c8d8bb9f6b12f09dfdf0273da25fda9e314f0b684b415a07"},
+    {file = "pyrsistent-0.18.1.tar.gz", hash = "sha256:d4d61f8b993a7255ba714df3aca52700f8125289f84f704cf80916517c46eb96"},
+]
 pytest = [
     {file = "pytest-7.1.2-py3-none-any.whl", hash = "sha256:13d0e3ccfc2b6e26be000cb6568c832ba67ba32e719443bfe725814d3c42433c"},
     {file = "pytest-7.1.2.tar.gz", hash = "sha256:a06a0425453864a270bc45e71f783330a7428defb4230fb5e6a731fde06ecd45"},
@@ -1056,8 +1143,8 @@ secretstorage = [
     {file = "SecretStorage-3.3.2.tar.gz", hash = "sha256:0a8eb9645b320881c222e827c26f4cfcf55363e8b374a021981ef886657a912f"},
 ]
 shellingham = [
-    {file = "shellingham-1.4.0-py2.py3-none-any.whl", hash = "sha256:536b67a0697f2e4af32ab176c00a50ac2899c5a05e0d8e2dadac8e58888283f9"},
-    {file = "shellingham-1.4.0.tar.gz", hash = "sha256:4855c2458d6904829bd34c299f11fdeed7cfefbf8a2c522e4caea6cd76b3171e"},
+    {file = "shellingham-1.5.0-py2.py3-none-any.whl", hash = "sha256:a8f02ba61b69baaa13facdba62908ca8690a94b8119b69f5ec5873ea85f7391b"},
+    {file = "shellingham-1.5.0.tar.gz", hash = "sha256:72fb7f5c63103ca2cb91b23dee0c71fe8ad6fbfd46418ef17dbe40db51592dad"},
 ]
 six = [
     {file = "six-1.16.0-py2.py3-none-any.whl", hash = "sha256:8abb2f1d86890a2dfb989f9a77cfcfd3e47c2a354b01111771326f8aa26e0254"},
@@ -1072,8 +1159,8 @@ tomli = [
     {file = "tomli-2.0.1.tar.gz", hash = "sha256:de526c12914f0c550d15924c62d72abc48d6fe7364aa87328337a31007fe8a4f"},
 ]
 tomlkit = [
-    {file = "tomlkit-0.11.0-py3-none-any.whl", hash = "sha256:0f4050db66fd445b885778900ce4dd9aea8c90c4721141fde0d6ade893820ef1"},
-    {file = "tomlkit-0.11.0.tar.gz", hash = "sha256:71ceb10c0eefd8b8f11fe34e8a51ad07812cb1dc3de23247425fbc9ddc47b9dd"},
+    {file = "tomlkit-0.11.4-py3-none-any.whl", hash = "sha256:25d4e2e446c453be6360c67ddfb88838cfc42026322770ba13d1fbd403a93a5c"},
+    {file = "tomlkit-0.11.4.tar.gz", hash = "sha256:3235a9010fae54323e727c3ac06fb720752fe6635b3426e379daec60fbd44a83"},
 ]
 typed-ast = [
     {file = "typed_ast-1.5.4-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:669dd0c4167f6f2cd9f57041e03c3c2ebf9063d0757dc89f79ba1daa2bfca9d4"},
diff --git a/pyproject.toml b/pyproject.toml
index 0ffcc8c..d364317 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,8 +18,8 @@ include = [
 
 [tool.poetry.dependencies]
 python = "^3.7"
-poetry = "^1.2.0b3"
-poetry-core = "^1.1.0b3"
+poetry = "^1.2.0"
+poetry-core = "^1.1.0"
 
 [tool.poetry.dev-dependencies]
 pre-commit = "^2.18"
diff --git a/src/poetry_plugin_export/exporter.py b/src/poetry_plugin_export/exporter.py
index 1525820..cacb439 100644
--- a/src/poetry_plugin_export/exporter.py
+++ b/src/poetry_plugin_export/exporter.py
@@ -167,7 +167,7 @@ def _export_requirements_txt(self, cwd: Path, output: IO | str) -> None:
                         if self._with_credentials
                         else repository.url
                     )
-                    indexes_header = f"--index-url {url}\n"
+                    indexes_header += f"--index-url {url}\n"
                     continue
 
                 url = (
diff --git a/tests/test_exporter.py b/tests/test_exporter.py
index 68fb733..0ce8979 100644
--- a/tests/test_exporter.py
+++ b/tests/test_exporter.py
@@ -1804,6 +1804,114 @@ def test_exporter_exports_requirements_txt_with_legacy_packages_and_duplicate_so
     assert content == expected
 
 
+def test_exporter_exports_requirements_txt_with_default_and_secondary_sources(
+    tmp_dir: str, poetry: Poetry
+) -> None:
+    poetry.pool.remove_repository("PyPI")
+    poetry.config.merge(
+        {
+            "repositories": {
+                "custom-a": {"url": "https://a.example.com/simple"},
+                "custom-b": {"url": "https://b.example.com/simple"},
+            },
+            "http-basic": {
+                "custom-a": {"username": "foo", "password": "bar"},
+                "custom-b": {"username": "baz", "password": "qux"},
+            },
+        }
+    )
+    poetry.pool.add_repository(
+        LegacyRepository(
+            "custom-b",
+            "https://b.example.com/simple",
+            config=poetry.config,
+        ),
+        default=True,
+    )
+    poetry.pool.add_repository(
+        LegacyRepository(
+            "custom-a",
+            "https://a.example.com/simple",
+            config=poetry.config,
+        ),
+        secondary=True,
+    )
+    poetry.locker.mock_lock_data(  # type: ignore[attr-defined]
+        {
+            "package": [
+                {
+                    "name": "foo",
+                    "version": "1.2.3",
+                    "category": "main",
+                    "optional": False,
+                    "python-versions": "*",
+                    "source": {
+                        "type": "legacy",
+                        "url": "https://a.example.com/simple",
+                        "reference": "",
+                    },
+                },
+                {
+                    "name": "bar",
+                    "version": "4.5.6",
+                    "category": "dev",
+                    "optional": False,
+                    "python-versions": "*",
+                    "source": {
+                        "type": "legacy",
+                        "url": "https://b.example.com/simple",
+                        "reference": "",
+                    },
+                },
+                {
+                    "name": "baz",
+                    "version": "7.8.9",
+                    "category": "dev",
+                    "optional": False,
+                    "python-versions": "*",
+                    "source": {
+                        "type": "legacy",
+                        "url": "https://b.example.com/simple",
+                        "reference": "",
+                    },
+                },
+            ],
+            "metadata": {
+                "python-versions": "*",
+                "content-hash": "123456789",
+                "files": {
+                    "foo": [{"name": "foo.whl", "hash": "12345"}],
+                    "bar": [{"name": "bar.whl", "hash": "67890"}],
+                    "baz": [{"name": "baz.whl", "hash": "24680"}],
+                },
+            },
+        }
+    )
+    set_package_requires(poetry)
+
+    exporter = Exporter(poetry)
+    exporter.only_groups([MAIN_GROUP, "dev"])
+    exporter.with_credentials()
+    exporter.export("requirements.txt", Path(tmp_dir), "requirements.txt")
+
+    with (Path(tmp_dir) / "requirements.txt").open(encoding="utf-8") as f:
+        content = f.read()
+
+    expected = f"""\
+--extra-index-url https://foo:bar@a.example.com/simple
+--index-url https://baz:qux@b.example.com/simple
+
+bar==4.5.6 ; {MARKER_PY} \\
+    --hash=sha256:67890
+baz==7.8.9 ; {MARKER_PY} \\
+    --hash=sha256:24680
+foo==1.2.3 ; {MARKER_PY} \\
+    --hash=sha256:12345
+"""
+
+    assert content == expected
+
+
 def test_exporter_exports_requirements_txt_with_legacy_packages_and_credentials(
     tmp_dir: str, poetry: Poetry, config: Config
 ) -> None: