Update pycodestyle to 2.4.0

[pyup-bot]

This PR updates pycodestyle from 2.3.1 to 2.4.0.

Changelog

2.4.0

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

New checks:

* Add W504 warning for checking that a break doesn't happen after a binary
operator. This check is ignored by default. PR 502.
* Add W605 warning for invalid escape sequences in string literals. PR 676.
* Add W606 warning for 'async' and 'await' reserved keywords being introduced
in Python 3.7. PR 684.
* Add E252 error for missing whitespace around equal sign in type annotated
function arguments with defaults values. PR 717.

Changes:

* An internal bisect search has replaced a linear search in order to improve
efficiency. PR 648.
* pycodestyle now uses PyPI trove classifiers in order to document supported
python versions on PyPI. PR 654.
* 'setup.cfg' '[wheel]' section has been renamed to '[bdist_wheel]', as
the former is legacy. PR 653.
* pycodestyle now handles very long lines much more efficiently for python
3.2+. Fixes 643. PR 644.
* You can now write 'pycodestyle.StyleGuide(verbose=True)' instead of
'pycodestyle.StyleGuide(verbose=True, paths=['-v'])' in order to achieve
verbosity. PR 663.
* The distribution of pycodestyle now includes the license text in order to
comply with open source licenses which require this. PR 694.
* 'maximum_line_length' now ignores shebang ('!') lines. PR 736.
* Add configuration option for the allowed number of blank lines. It is
implemented as a top level dictionary which can be easily overwritten. Fixes
732. PR 733.

Bugs:

* Prevent a 'DeprecationWarning', and a 'SyntaxError' in future python, caused
by an invalid escape sequence. PR 625.
* Correctly report E501 when the first line of a docstring is too long.
Resolves 622. PR 630.
* Support variable annotation when variable start by a keyword, such as class
variable type annotations in python 3.6. PR 640.
* pycodestyle internals have been changed in order to allow 'python3 -m
cProfile' to report correct metrics. PR 647.
* Fix a spelling mistake in the description of E722. PR 697.
* 'pycodestyle --diff' now does not break if your 'gitconfig' enables
'mnemonicprefix'. PR 706.

Links

• PyPI: https://pypi.org/project/pycodestyle
• Changelog: https://pyup.io/changelogs/pycodestyle/
• Docs: https://pycodestyle.readthedocs.io/

[pyup-bot]

Closing this in favor of #210