Update pep8 to 1.7.1

[pyup-bot]

This PR updates pep8 from 1.7.0 to 1.7.1.

The bot wasn't able to find a changelog for this release. Got an idea?

Links

• PyPI: https://pypi.org/project/pep8
• Changelog: https://pyup.io/changelogs/pep8/
• Docs: http://pep8.readthedocs.org/

[codecov-io]

Codecov Report

Merging #212 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #212   +/-   ##
========================================
  Coverage    96.14%   96.14%           
========================================
  Files           23       23           
  Lines          467      467           
========================================
  Hits           449      449           
  Misses          18       18

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