How to contributing to this package.
Run make test. This checks whether the auto-generated list of classifiers
matches the input source.
Run make lint.
To add a new classifier, add to the classifiers set in
trove_classifiers/__init__.py.
To deprecate a classifier, move it from classifiers to
deprecated_classifiers in trove_classifiers/__init__.py, and list any new
classifiers that may replace it.