Update py to 1.8.1

[pyup-bot]

This PR updates py from 1.8.0 to 1.8.1.

Changelog

1.8.1

==================

- Handle ``FileNotFoundError`` when trying to import pathlib in ``path.common``
on Python 3.4 (207).

- ``py.path.local.samefile`` now works correctly in Python 3 on Windows when dealing with symlinks.

Links

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

[codecov-io]

Codecov Report

Merging #73 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #73   +/-   ##
=======================================
  Coverage   78.13%   78.13%           
=======================================
  Files           5        5           
  Lines         247      247           
=======================================
  Hits          193      193           
  Misses         54       54

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[pyup-bot]

Closing this in favor of #119

[pyup-bot]

Closing this in favor of #119