[pre-commit.ci] pre-commit autoupdate

[pre-commit-ci]

updates:

• github.com/psf/black: 21.8b0 → 21.9b0

[codecov]

Codecov Report

Merging #98 (a13afd3) into master (692a509) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #98   +/-   ##
=======================================
  Coverage   99.11%   99.11%           
=======================================
  Files           4        4           
  Lines         226      226           
  Branches        5        5           
=======================================
  Hits          224      224           
  Partials        2        2           

Flag	Coverage Δ
tests	99.11% <ø> (ø)

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