As this library has been struggling keeping up with maintenance (correct me if I'm wrong about that), would it make sense to drop support for all the Python versions that has reached EOL?

Especially seeing the recent issues with six was quite surprising, as Python 2 has now been a dead language for close to 4 years.

Specifically I propose to drop support for versions 2.7, 3.4, 3.5, 3.6, and 3.7.