Scheduled weekly dependency update for week 09

[pyup-bot]

Updates

Here's a list of all the updates bundled in this pull request. I've added some links to make it easier for you to find all the information you need.

cffi	1.11.4	»	1.11.5	PyPI | Changelog | Docs
packaging	16.8	»	17.1	PyPI | Changelog | Repo

Changelogs

cffi 1.11.4 -> 1.11.5

1.11.5

=======

• Issue 357_: fix ffi.emit_python_code() which generated a buggy
  Python file if you are using a struct with an anonymous union
  field or vice-versa.

• Windows: ffi.dlopen() should now handle unicode filenames.

• ABI mode: implemented ffi.dlclose() for the in-line case (it used
  to be present only in the out-of-line case).

• Fixed a corner case for setup.py install --record=xx --root=yy
  with an out-of-line ABI module. Also fixed Issue 345_.

• More hacks on Windows for running CFFI's own setup.py.

• Issue 358_: in embedding, to protect against (the rare case of)
  Python initialization from several threads in parallel, we have to use
  a spin-lock. On CPython 3 it is worse because it might spin-lock for
  a long time (execution of Py_InitializeEx()). Sadly, recent
  changes to CPython make that solution needed on CPython 2 too.

• CPython 3 on Windows: we no longer compile with Py_LIMITED_API
  by default because such modules cannot be used with virtualenv.
  Issue 350_ mentions a workaround if you still want that and are not
  concerned about virtualenv: pass a define_macros=[("Py_LIMITED_API", None)] to the ffibuilder.set_source() call.

.. _Issue 345: https://bitbucket.org/cffi/cffi/issues/345/
.. _Issue 350: https://bitbucket.org/cffi/cffi/issues/350/
.. _Issue 358: https://bitbucket.org/cffi/cffi/issues/358/
.. _Issue 357: https://bitbucket.org/cffi/cffi/issues/357/

packaging 16.8 -> 17.1

17.1

• Fix utils.canonicalize_version when supplying non PEP 440 versions.

17.0

• Drop support for python 2.6, 3.2, and 3.3.

• Define minimal pyparsing version to 2.0.2 (:issue:91).

• Add epoch, release, pre, dev, and post attributes to
  Version and LegacyVersion (:issue:34).

• Add Version().is_devrelease and LegacyVersion().is_devrelease to
  make it easy to determine if a release is a development release.

• Add utils.canonicalize_version to canonicalize version strings or
  Version instances (:issue:121).

That's it for now!

Happy merging! 🤖

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This change is 

[mithrandi]

bors r+

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