Merge pull request #383 from fantix/pyup-update-pytest-3.9.1-to-3.10.0

Update pytest to 3.10.0

Author: wwwjfy

requirements_dev.txt

@@ -15,7 +15,7 @@ quart==0.6.8;python_version>="3.6"
 coverage==4.5.1  # pyup: update minor
 flake8==3.5.0  # pyup: update minor
 tox==3.5.2  # pyup: update minor
-pytest==3.9.1  # pyup: update minor
+pytest==3.10.0  # pyup: update minor
 pytest-runner==4.2  # pyup: update minor
 pytest-asyncio==0.9.0  # pyup: update minor
 pytest-tornado==0.5.0  # pyup: update minor