Bump py from 1.5.3 to 1.10.0

Bumps [py](https://github.com/pytest-dev/py) from 1.5.3 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@1.5.3...1.10.0)

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

requirements.txt

@@ -8,7 +8,7 @@ idna==2.6
 more-itertools==4.1.0
 numpy==1.14.2
 pluggy==0.6.0
-py==1.5.3
+py==1.10.0
 pytest==3.5.0
 pytest-cov==2.5.1
 requests==2.18.4