[pre-commit.ci] pre-commit autoupdate

[pre-commit-ci]

updates:

• github.com/psf/black: 21.4b0 → 21.4b2

[codecov]

Codecov Report

Merging #309 (9551a0b) into main (1b251af) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #309   +/-   ##
=======================================
  Coverage   96.32%   96.32%           
=======================================
  Files           6        6           
  Lines         272      272           
=======================================
  Hits          262      262           
  Misses         10       10           

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