github action for black formatter and running black on the repo

[digitalsignalperson]

black.yml is setup per the official instructions here https://black.readthedocs.io/en/stable/integrations/github_actions.html

I tested these 3 commits here digitalsignalperson#1 to see the action fail initially, then pass after running black . on the repo

black .
reformatted /home/andy1/git/lieer/lieer/__init__.py
reformatted /home/andy1/git/lieer/tests/__init__.py
reformatted /home/andy1/git/lieer/tests/test_local.py
reformatted /home/andy1/git/lieer/setup.py
reformatted /home/andy1/git/lieer/lieer/nobar.py
reformatted /home/andy1/git/lieer/lieer/resume.py
reformatted /home/andy1/git/lieer/lieer/local.py
reformatted /home/andy1/git/lieer/lieer/remote.py
reformatted /home/andy1/git/lieer/lieer/gmailieer.py

All done! ✨ 🍰 ✨

[digitalsignalperson]

Hmm, maybe it would help to split into 2 PRs, one just for the github action, and then one just for pushing the formatting changes from running black

[gauteh]

Thanks. I don't think I can merge this before #242 goes in, otherwise that PR is going to be completely messed up. It should be easy to update this PR later by keeping the first two commits and redoing the auto-formatting.

[gauteh]

Thanks, finally merged.