Merge pull request #460 from adamtheturtle/pyup-update-pytest-3.3.2-to-3.4.0

Update pytest to 3.4.0

Author: adamtheturtle

dev-requirements.txt

@@ -15,7 +15,7 @@ pylint==1.8.2  # Lint
 pyroma==2.3  # Packaging best practices checker
 pytest-cov==2.5.1  # Measure code coverage
 pytest-envfiles==0.1.0  # Use files for environment variables for tests
-pytest==3.3.2  # Test runners
+pytest==3.4.0  # Test runners
 timeout-decorator==0.4.0  # Decorate functions to time out.
 vulture==0.26
 yapf==0.20.1  # Automatic formatting for Python