Merge #80

80: Update pytest to 4.6.0 r=rehandalal a=pyup-bot


This PR updates [pytest](https://pypi.org/project/pytest) from **4.5.0** to **4.6.0**.



*The bot wasn't able to find a changelog for this release. [Got an idea?](https://github.com/pyupio/changelogs/issues/new)*

<details>
  <summary>Links</summary>
  
  - PyPI: https://pypi.org/project/pytest
  - Changelog: https://pyup.io/changelogs/pytest/
  - Homepage: https://docs.pytest.org/en/latest/
</details>



Co-authored-by: pyup-bot <github-bot@pyup.io>

Author: bors[bot]

requirements-dev.txt

@@ -1,3 +1,3 @@
 -r requirements.txt
-pytest==4.5.0
+pytest==4.6.0
 pytest-cov==2.7.1