Update requirements.txt

[Rosi2143]

add "pre-commit" to list of requirements

Description:

the package "pre-commit" was missing in the list of requirements

Checklist:

• Local tests with tox run successfully PR cannot be meged unless tests pass
• Changes tested locally to ensure platform still works as intended
• [no] Tests added to verify new code works

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (daea3cf) 99.65% compared to head (3e7ba5c) 99.65%.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #814   +/-   ##
=======================================
  Coverage   99.65%   99.65%           
=======================================
  Files           8        8           
  Lines        1447     1447           
=======================================
  Hits         1442     1442           
  Misses          5        5           

Flag	Coverage Δ
unittests	99.65% <ø> (ø)

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[fronzbot]

I appreciate the PR, but I'm not going to merge it for two reasons:

1. Any test related tools go into requirements_test.txt, not requirements.txt
2. I actually previously removed pre-commit requirement in this commit aa869cc#diff-8e46fa47648f051555a15d35f67ccace2ed6fcbb3404460adb964140d9f119a1

Ultimately I decided that I didn't want pre-commit to be a thing forced on contributors so don't want to maintain it as a requirement in the library