python.pkgs.zimports: init at 0.2.0

The author gives a pretty good overview of why one would want to use
zimports over other import organizers:

https://github.com/sqlalchemyorg/zimports/tree/0.2.0#zzzeek-why-are-you-writing-one-of-these-there-are-a-dozen-pep8-import-fixers