Installing "less than" dependency fails to find the package

[MadWombat]

• I am on the latest Poetry version.

• I have searched the issues of this repo and believe that this is not a duplicate.

• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• OS version and name: OS X Mojave. Darwin Kernel Version 18.6.0: Thu Apr 25 23:16:27 PDT 2019; root:xnu-4903.261.4~2/RELEASE_X86_64

• Poetry version: Poetry 0.12.17

• Link of a Gist with the contents of your pyproject.toml file:
  https://gist.github.com/MadWombat/a9cf58d94bc0a683c2138dad04a3e8a4

Installing a dependency for Django LTS works fine with pip, but fails with poetry

with pip:

~/project/> pip3 install 'Django<1.12'
Collecting Django<1.12
  Downloading https://files.pythonhosted.org/packages/70/22/237da71dc112f2bba335c18380bc403fba430c44cc4da088824e77652738/Django-1.11.22-py2.py3-none-any.whl (6.9MB)
     |████████████████████████████████| 7.0MB 3.9MB/s 
Collecting pytz (from Django<1.12)
  Using cached https://files.pythonhosted.org/packages/3d/73/fe30c2daaaa0713420d0382b16fbb761409f532c56bdcc514bf7b6262bb6/pytz-2019.1-py2.py3-none-any.whl
Installing collected packages: pytz, Django
Successfully installed Django-1.11.22 pytz-2019.1

with poetry:

~/project> poetry add 'Django<1.12'
                                    
[PackageNotFound]    
Package [Django<1.12] not found.  
                                    
add [-D|--dev] [--git GIT] [--path PATH] [-E|--extras EXTRAS] [--optional] [--python PYTHON] [--platform PLATFORM] [--allow-prereleases] [--dry-run] [--] <name> (<name>)...

[sdispater]

At the moment, you have to do it like so:

poetry add "django:<1.12"

The notation you are using will be supported in the 1.0.0 verson (see #1221)

[github-actions]

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