[pre-commit.ci] pre-commit autoupdate

[pre-commit-ci]

updates:

• github.com/PyCQA/flake8: 3.9.2 → 4.0.1

[codecov]

Codecov Report

Merging #246 (d362e52) into master (17c9c49) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #246   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines          107       107           
  Branches        16        16           
=========================================
  Hits           107       107           

Flag	Coverage Δ
unit	98.13% <ø> (ø)

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