[pre-commit.ci] pre-commit autoupdate

[pre-commit-ci]

updates:

• github.com/psf/black: 21.9b0 → 21.10b0

[codecov]

Codecov Report

Merging #23 (53f70cc) into main (9fc5ae0) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #23   +/-   ##
=======================================
  Coverage   90.81%   90.81%           
=======================================
  Files           3        3           
  Lines         196      196           
=======================================
  Hits          178      178           
  Misses         18       18           

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