[pre-commit.ci] pre-commit autoupdate

[pre-commit-ci]

updates:

• github.com/psf/black: 21.5b2 → 21.6b0
• github.com/nbQA-dev/nbQA: 0.11.1 → 0.12.0

[codecov]

Codecov Report

Merging #185 (2af8c45) into master (924e8c5) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #185   +/-   ##
=======================================
  Coverage   95.30%   95.30%           
=======================================
  Files          10       10           
  Lines        3809     3809           
  Branches      842      842           
=======================================
  Hits         3630     3630           
  Misses         99       99           
  Partials       80       80           

Flag	Coverage Δ
unittests	95.30% <ø> (ø)

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