Update pylint from 2.1.1 to 2.2.2

Author: pyup-bot

dev-requirements.txt

@@ -14,7 +14,7 @@ pydocstyle==3.0.0  # Lint docstrings
 pyenchant==2.0.0  # Bindings for a spellchecking sytem
 pygithub==1.43.3
 Pygments==2.2.0
-pylint==2.1.1  # Lint
+pylint==2.2.2  # Lint
 pyroma==2.4  # Packaging best practices checker
 pytest-cov==2.6.0  # Measure code coverage
 pytest==4.0.1  # Test runners