Bump py from 1.4.30 to 1.11.0

Bumps [py](https://github.com/pytest-dev/py) from 1.4.30 to 1.11.0.
- [Release notes](https://github.com/pytest-dev/py/releases)
- [Changelog](https://github.com/pytest-dev/py/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/py@1.4.30...1.11.0)

---
updated-dependencies:
- dependency-name: py
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements.txt

@@ -5,7 +5,7 @@ gunicorn==19.3.0
 httplib2==0.9.1
 pbr==1.3.0
 psycopg2==2.6.1
-py==1.4.30
+py==1.11.0
 pytest==2.7.2
 pytest-cov==2.0.0
 pytest-django==2.8.0