docs: Fix badge underline artifacts in readme

[vdusek]

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.97%. Comparing base (ea0a3c0) to head (2e0873d).
⚠️ Report is 4 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (ea0a3c0) and HEAD (2e0873d). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (ea0a3c0)	HEAD (2e0873d)
integration	1	0

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #714       +/-   ##
===========================================
- Coverage   82.00%   67.97%   -14.04%     
===========================================
  Files          46       46               
  Lines        2679     2679               
===========================================
- Hits         2197     1821      -376     
- Misses        482      858      +376     

Flag	Coverage Δ
integration	?
unit	67.97% <ø> (ø)

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