Bump py from 1.8.0 to 1.10.0

Bumps [py](https://github.com/pytest-dev/py) from 1.8.0 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@1.8.0...1.10.0)

Signed-off-by: dependabot[bot] <support@github.com>

requirements.txt

@@ -13,7 +13,7 @@ kerberos==1.3.0
 #mock
 nose==1.3.7
 nose2==0.9.1
-py==1.8.0
+py==1.10.0
 # PyLint fails some checks in Travis that pass locally
 #pylint==1.5.2
 # requires Python 3.5+