docs: Fix badge underline artifacts in readme

[vdusek]

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.98%. Comparing base (14e2c1a) to head (5692fac).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #561   +/-   ##
=======================================
  Coverage   75.98%   75.98%           
=======================================
  Files          42       42           
  Lines        2465     2465           
=======================================
  Hits         1873     1873           
  Misses        592      592           

Flag	Coverage Δ
integration	68.92% <ø> (ø)
unit	64.54% <ø> (ø)

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