The presence of the generic
Programming Language :: Python classifier appears to cause pip in Python 2.7 to still install new releases of this package, even though support for Python 2 was removed from this package in the current release. Removing the generic "Python" classifier should prevent this issue, by reading between the lines of the Python Packaging tutorial](https://packaging.python.org/tutorials/packaging-projects/#creating-setup-py)) ("In this case, the package is only compatible with Python 3").
Just to be certain, this also adds the
Programming Language :: Python :: 3 :: Only classifier.