Update flake8 to 3.6.0

[pyup-bot]

This PR updates flake8 from 3.5.0 to 3.6.0.

Changelog

3.6.0

-------------------

You can view the `3.6.0 milestone`_ on GitLab for more details.

New Dependency Information
~~~~~~~~~~~~~~~~~~~~~~~~~~

- pycodestyle has been updated to >= 2.4.0, < 2.5.0 (See also `GitLab381`_,
`GitLab415`_, `GitLab!212`_, `GitLab!230`_, `GitLab!231`_)

- Pyflakes has been updated to >= 2.0.0, < 2.1.0 (See also `GitLab422`_,
`GitLab!239`_)

- flake8 requires python 2.x >= 2.7 or python 3.x >= 3.4 (See also
`GitLab!225`_)

Features
~~~~~~~~

- Add ``paths`` to allow local plugins to exist outside of ``sys.path`` (See
also `GitLab379`_, `GitLab!211`_)

- Copy ``setup.cfg`` files to the temporary git hook execution directory (See
also `GitLab!215`_)

- Only skip a file if `` flake8: noqa`` is on a line by itself (See also
`GitLab453`_, `GitLab!219`_)

- Provide a better user experience for broken plugins (See also `GitLab!221`_)

- Report ``E902`` when a file passed on the command line does not exist (See
also `GitLab405`_, `GitLab!227`_)

- Add ``--extend-ignore`` for extending the default ``ignore`` instead of
overriding it (See also `GitLab!233`_)

Bugs Fixed
~~~~~~~~~~

- Respect a formatter's newline setting when printing (See also `GitLab!222`_)

- Fix leaking of processes in the legacy api (See also `GitLab410`_,
`GitLab!228`_)

- Fix a ``SyntaxWarning`` for an invalid escape sequence (See also
`GitLab!244`_)

- Fix ``DeprecationWarning`` due to import of ``abc`` classes from the
``collections`` module (See also `GitLab!249`_)

- Defer ``setuptools`` import to improve flake8 startup time (See also
`GitLab365`_, `GitLab!250`_)

- Fix inconsistent line endings in ``FileProcessor.lines`` when running under
python 3.x (See also `GitLab457`_, `GitLab!255`_)


.. all links
.. _3.6.0 milestone:
 https://gitlab.com/pycqa/flake8/milestones/21

.. issue links
.. _GitLab365:
 https://gitlab.com/pycqa/flake8/issues/365
.. _GitLab379:
 https://gitlab.com/pycqa/flake8/issues/379
.. _GitLab381:
 https://gitlab.com/pycqa/flake8/issues/381
.. _GitLab405:
 https://gitlab.com/pycqa/flake8/issues/405
.. _GitLab410:
 https://gitlab.com/pycqa/flake8/issues/410
.. _GitLab415:
 https://gitlab.com/pycqa/flake8/issues/415
.. _GitLab422:
 https://gitlab.com/pycqa/flake8/issues/422
.. _GitLab453:
 https://gitlab.com/pycqa/flake8/issues/453
.. _GitLab457:
 https://gitlab.com/pycqa/flake8/issues/457

.. merge request links
.. _GitLab!211:
 https://gitlab.com/pycqa/flake8/merge_requests/211
.. _GitLab!212:
 https://gitlab.com/pycqa/flake8/merge_requests/212
.. _GitLab!215:
 https://gitlab.com/pycqa/flake8/merge_requests/215
.. _GitLab!219:
 https://gitlab.com/pycqa/flake8/merge_requests/219
.. _GitLab!221:
 https://gitlab.com/pycqa/flake8/merge_requests/221
.. _GitLab!222:
 https://gitlab.com/pycqa/flake8/merge_requests/222
.. _GitLab!225:
 https://gitlab.com/pycqa/flake8/merge_requests/225
.. _GitLab!227:
 https://gitlab.com/pycqa/flake8/merge_requests/227
.. _GitLab!228:
 https://gitlab.com/pycqa/flake8/merge_requests/228
.. _GitLab!230:
 https://gitlab.com/pycqa/flake8/merge_requests/230
.. _GitLab!231:
 https://gitlab.com/pycqa/flake8/merge_requests/231
.. _GitLab!233:
 https://gitlab.com/pycqa/flake8/merge_requests/233
.. _GitLab!239:
 https://gitlab.com/pycqa/flake8/merge_requests/239
.. _GitLab!244:
 https://gitlab.com/pycqa/flake8/merge_requests/244
.. _GitLab!249:
 https://gitlab.com/pycqa/flake8/merge_requests/249
.. _GitLab!250:
 https://gitlab.com/pycqa/flake8/merge_requests/250
.. _GitLab!255:
 https://gitlab.com/pycqa/flake8/merge_requests/255

Links

• PyPI: https://pypi.org/project/flake8
• Changelog: https://pyup.io/changelogs/flake8/
• Repo: https://gitlab.com/pycqa/flake8