Warn about "Capitals_With_Underscore" names #131
Description
PEP8 describes "Capitals_With_Underscores" as ugly (https://www.python.org/dev/peps/pep-0008/#descriptive-naming-styles) and never recommends that it be used anywhere, but, as far as I can tell, pep8-naming doesn't show a warning for variable names that follow it.