Update pycodestyle requirement from <2.4.0,>=2.3.0 to >=2.3.0,<2.6.0

[dependabot-preview]

Updates the requirements on pycodestyle to permit the latest version.

Changelog

Sourced from pycodestyle's changelog.

2.5.0 (2019-01-29)

New checks:

• E117: Over-indented code blocks
• W505: Maximum doc-string length only when configured with --max-doc-length

Changes:

• Remove support for EOL Python 2.6 and 3.3. PR #720.
• Add E117 error for over-indented code blocks.
• Allow W605 to be silenced by # noqa and fix the position reported by W605
• Allow users to omit blank lines around one-liner definitions of classes and
  functions
• Include the function return annotation (->) as requiring surrounding
  whitespace only on Python 3
• Verify that only names can follow await. Previously we allowed numbers
  and strings.
• Add support for Python 3.7
• Fix detection of annotated argument defaults for E252
• Cprrect the position reported by W504

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.

... (truncated)

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