Revert "setup.cfg: let python-tag mirror python_requires"
Revert "setup.cfg: let python-tag mirror python_requires"

This reverts commit 0b681b040f3e13793c61c1dfe6e510d9e3a8870a. Ref jaraco/zipp#42

jaraco/backports.functools_lru_cache,yougov/pmxbot,jaraco/keyring,python/importlib_metadata,yougov/pmxbot,jaraco/hgtools,yougov/pmxbot,jaraco/portend,jaraco/jaraco.collections,jaraco/zipp,jaraco/jaraco.logging,pytest-dev/pytest-runner,jaraco/jaraco.path,jaraco/irc,jazzband/inflect,jaraco/jaraco.itertools,pwdyson/inflect.py,jaraco/jaraco.context,jaraco/tempora,jaraco/jaraco.functools,jaraco/jaraco.text,jaraco/jaraco.stream,jaraco/jaraco.classes,jaraco/calendra