build(deps): bump py from 1.5.3 to 1.5.4 (#27)

Bumps [py](https://github.com/pytest-dev/py) from 1.5.3 to 1.5.4.
- [Release notes](https://github.com/pytest-dev/py/releases)
- [Changelog](https://github.com/pytest-dev/py/blob/master/CHANGELOG)
- [Commits](pytest-dev/py@1.5.3...1.5.4)

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

requirements.txt

@@ -30,7 +30,7 @@ passlib==1.7.1
 pluggy==0.6.0
 protobuf==3.6.0
 psycopg2-binary==2.7.5
-py==1.5.3
+py==1.5.4
 pyasn1==0.4.3
 pyasn1-modules==0.2.1
 pytest==3.6.2