Bump py from 1.4.26 to 1.10.0

Bumps [py](https://github.com/pytest-dev/py) from 1.4.26 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@1.4.26...1.10.0)

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

requirements.txt

@@ -6,7 +6,7 @@ docutils==0.12
 flake8==2.2.5
 mccabe==0.2.1
 pep8==1.5.7
-py==1.4.26
+py==1.10.0
 pycrypto==2.6.1
 pyflakes==0.8.1
 six==1.8.0