Update and apply Pre-Commit hooks

[btschwertfeger]

• Updating pre-commit hooks to latest stable releases
• applying pre-commit suggestions where needed
• fixing typos in documentation found by Fix typo in methods.rst #133.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 96.17%. Comparing base (471abb3) to head (e42011c).
Report is 13 commits behind head on master.

Files with missing lines	Patch %	Lines
cmethods/__init__.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #134   +/-   ##
=======================================
  Coverage   96.17%   96.17%           
=======================================
  Files           7        7           
  Lines         314      314           
=======================================
  Hits          302      302           
  Misses         12       12           

Flag	Coverage Δ
unittests	96.17% <50.00%> (ø)

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

Files with missing lines	Coverage Δ
cmethods/core.py	92.30% <100.00%> (ø)
cmethods/distribution.py	97.97% <ø> (ø)
cmethods/scaling.py	100.00% <ø> (ø)
cmethods/utils.py	96.55% <ø> (ø)
cmethods/__init__.py	91.83% <0.00%> (ø)