Fix Python 3.8 issue, use separate flake8 pre-commit hook, fix tests #320
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Starting with Python 3.8 it's not possible to import
Mapping
fromcollections
, we'll need to usecollections.abc
as package.Additionally, I'm introducing the separate flake8 pre-commit hook as well as changing things around pre-commit hook installation slightly to make sure running
tox
directly also installs them. I've also incorporated the fix from #319 with one slight modification so the tests pass on Python 3.