Convert setup.py to static setup.cfg

[hugovk]

Converted using https://github.com/asottile/setup-py-upgrade. First this happened:

$ setup-py-upgrade .
use_scm_version= is not supported in setup.cfg

So temporarily removed that line from setup.py and re-ran it:

$ setup-py-upgrade .
./setup.py and ./setup.cfg written!

Then reinstated use_scm_version= and local_scheme(version) in setup.py.

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Also add https://github.com/asottile/setup-cfg-fmt to pre-commit and autoupdate.

[codecov]

Codecov Report

Merging #82 (b68b093) into master (ac1ec81) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master       #82   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines           13        13           
=========================================
  Hits            13        13           

Flag	Coverage Δ
GHA_Ubuntu1604	100.00% <ø> (ø)
GHA_Ubuntu1804	100.00% <ø> (ø)
GHA_Ubuntu2004	100.00% <ø> (ø)
GHA_macOS	100.00% <ø> (ø)

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