docs: improve setup instructions for pre-commit

[slhck]

No description provided.

[slhck]

Huh, not sure what made this test fail — I only changed some docs.

[woile]

Hey could you rebase this PR? I think it should work once rebased. Thanks!

[slhck]

That's weird. When was the README changed? I did the PR directly after forking that repo.

Anyway, it's rebased now.

[codecov]

Codecov Report

Base: 98.36% // Head: 98.37% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (42e3dca) compared to base (836a94a).
Patch coverage: 96.42% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #564      +/-   ##
==========================================
+ Coverage   98.36%   98.37%   +0.01%     
==========================================
  Files          39       39              
  Lines        1590     1603      +13     
==========================================
+ Hits         1564     1577      +13     
  Misses         26       26              

Flag	Coverage Δ
unittests	98.37% <96.42%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
commitizen/commands/changelog.py	98.85% <ø> (+2.22%)	⬆️
commitizen/git.py	99.27% <95.45%> (-0.73%)	⬇️
commitizen/__version__.py	100.00% <100.00%> (ø)
commitizen/changelog.py	99.43% <100.00%> (-0.57%)	⬇️
commitizen/exceptions.py	100.00% <100.00%> (ø)

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