Update pygments from 2.4.1 to 2.4.2

Author: pyup-bot

dev-requirements.txt

@@ -13,7 +13,7 @@ pip_check_reqs==2.0.3
 pydocstyle==3.0.0  # Lint docstrings
 pyenchant==2.0.0  # Bindings for a spellchecking sytem
 pygithub==1.43.7
-Pygments==2.4.1
+Pygments==2.4.2
 pylint==2.3.1  # Lint
 pyroma==2.4  # Packaging best practices checker
 pytest-cov==2.7.1  # Measure code coverage