Bump pycodestyle from 2.3.1 to 2.4.0

[dependabot-preview]

Bumps pycodestyle from 2.3.1 to 2.4.0.

Changelog

Sourced from pycodestyle's changelog.

2.4.0 (2018-04-10)

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.

Commits

• f73c4bb Release v2.4.0
• 72b90c5 Merge pull request #740 from JakobGM/docs/changes
• 51cf479 Add PR references from all changelog items
• 6d10bc7 Fixed typo
• 41438bf Add changelog items for 2.3.1...master
• 5d31e7e Add variables so blank lines may be configures
• 9f225ac Ignore length of shebang line (#736)
• 368e62c Finalize support for Python 3.7
• eb91b79 Merge pull request #684 from jdufresne/async-await
• 01ecae5 Updated License / copyright date
• Additional commits viewable in compare view

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