Update py to 1.8.2

[pyup-bot]

This PR updates py from 1.8.0 to 1.8.2.

Changelog

1.8.2

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

- On Windows, ``py.path.local``s which differ only in case now have the same
Python hash value. Previously, such paths were considered equal but had
different hashes, which is not allowed and breaks the assumptions made by
dicts, sets and other users of hashes.

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: https://py.readthedocs.io/

[pyup-bot]

Closing this in favor of #256