Update pycodestyle to 2.7.0

Created by: pyup-bot

This PR updates pycodestyle from 2.6.0 to 2.7.0.

Changelog

2.7.0

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Changes:

* Fix physical checks (such as W191) at end of file.  PR 961.
* Add ``--indent-size`` option (defaulting to ``4``).  PR 970.
* W605: fix escaped crlf false positive on windows.  PR 976.

Links

• PyPI: https://pypi.org/project/pycodestyle
• Changelog: https://pyup.io/changelogs/pycodestyle/
• Homepage: https://pycodestyle.pycqa.org/