Update README.md

[pokutta]

minor beautification

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.23%. Comparing base (3bcaffd) to head (d425415).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #526      +/-   ##
==========================================
- Coverage   78.94%   78.23%   -0.72%     
==========================================
  Files          24       24              
  Lines        3581     3620      +39     
==========================================
+ Hits         2827     2832       +5     
- Misses        754      788      +34     

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