Merge pull request #508 from adamtheturtle/pyup-update-pylint-1.8.3-to-1.8.4

Update pylint to 1.8.4

Author: adamtheturtle

dev-requirements.txt

@@ -12,7 +12,7 @@ mypy==0.600  # Type checking
 pip_check_reqs==2.0.1
 pydocstyle==2.1.1  # Lint docstrings
 pyenchant==2.0.0  # Bindings for a spellchecking sytem
-pylint==1.8.3  # Lint
+pylint==1.8.4  # 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