Improve CI and introduce pre-commit hooks

[sp1thas]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change

Comparison is base (3e97b45) 99.28% compared to head (3672c49) 99.28%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master      #22   +/-   ##
=======================================
  Coverage   99.28%   99.28%           
=======================================
  Files          31       31           
  Lines         839      839           
=======================================
  Hits          833      833           
  Misses          6        6           

Flag	Coverage Δ
unittests	99.28% <100.00%> (ø)

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Impacted Files	Coverage Δ
src/pyskroutz/models/favorites.py	100.00% <ø> (ø)
src/pyskroutz/models/filters.py	100.00% <ø> (ø)
src/pyskroutz/models/users.py	100.00% <ø> (ø)
src/pyskroutz/client.py	100.00% <100.00%> (ø)
src/pyskroutz/models/base.py	100.00% <100.00%> (ø)
src/pyskroutz/models/books.py	100.00% <100.00%> (ø)
src/pyskroutz/models/categories.py	100.00% <100.00%> (ø)
src/pyskroutz/models/flags.py	100.00% <100.00%> (ø)
src/pyskroutz/models/manufacturers.py	100.00% <100.00%> (ø)
src/pyskroutz/models/notifications.py	100.00% <100.00%> (ø)
... and 8 more

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