Bump py from 1.4.15 to 1.10.0 (#7)

Bumps [py](https://github.com/pytest-dev/py) from 1.4.15 to 1.10.0.
- [Release notes](https://github.com/pytest-dev/py/releases)
- [Changelog](https://github.com/pytest-dev/py/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/py@1.4.15...1.10.0)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

test_requirements.txt

@@ -1,6 +1,6 @@
 coverage==3.6
 mock==1.0.1
 nose==1.3.0
-py==1.4.15
+py==1.10.0
 tox==1.5.0
 virtualenv==1.9.1