[pre-commit.ci] pre-commit autoupdate

[pre-commit-ci]

updates:

• github.com/psf/black: 21.7b0 → 21.8b0

[codecov]

Codecov Report

Merging #241 (a9bdf27) into main (12dd33e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #241   +/-   ##
=======================================
  Coverage   95.08%   95.08%           
=======================================
  Files          10       10           
  Lines         224      224           
=======================================
  Hits          213      213           
  Misses         11       11           

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