Use GitHub for Flake8 pre-commit hook

[danlamanna]

Flake8 migrated to GitHub, see https://flake8.pycqa.org/en/latest/release-notes/4.0.0.html.

[codecov]

Codecov Report

Base: 96.67% // Head: 96.67% // No change to project coverage 👍

Coverage data is based on head (73a3b4f) compared to base (d34658c).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #154   +/-   ##
=======================================
  Coverage   96.67%   96.67%           
=======================================
  Files          18       18           
  Lines        1654     1654           
=======================================
  Hits         1599     1599           
  Misses         55       55           

Flag	Coverage Δ
unittests	96.67% <ø> (ø)

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