FIX README and update GitHub icon in documentation

[hynekkar]

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[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 40.59%. Comparing base (410124c) to head (c719114).
Report is 3 commits behind head on master.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #233   +/-   ##
=======================================
  Coverage   40.59%   40.59%           
=======================================
  Files         104      104           
  Lines       10120    10120           
  Branches     1492     1492           
=======================================
  Hits         4108     4108           
  Misses       5147     5147           
  Partials      865      865           

Flag	Coverage Δ
tests	40.59% <ø> (ø)

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