Add pytest-flake8

[Gallaecio]

No description provided.

[codecov]

Codecov Report

Merging #105 (23fe80f) into master (053f266) will increase coverage by 1.17%.
The diff coverage is 96.82%.

❗ Current head 23fe80f differs from pull request most recent head 8e45343. Consider uploading reports for the commit 8e45343 to get more accurate results

@@            Coverage Diff             @@
##           master     #105      +/-   ##
==========================================
+ Coverage   94.45%   95.62%   +1.17%     
==========================================
  Files           2        2              
  Lines         703      755      +52     
  Branches      115      128      +13     
==========================================
+ Hits          664      722      +58     
+ Misses         23       20       -3     
+ Partials       16       13       -3     

Impacted Files	Coverage Δ
cssselect/xpath.py	94.57% <75.00%> (+1.62%)	⬆️
cssselect/parser.py	96.30% <100.00%> (+0.74%)	⬆️

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