README.MD: Correct error in URL

[kalvotom]

This is a fix of a small error in URL.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.77%. Comparing base (3273457) to head (d6efd2e).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #30   +/-   ##
=======================================
  Coverage   77.77%   77.77%           
=======================================
  Files           2        2           
  Lines         396      396           
=======================================
  Hits          308      308           
  Misses         88       88           

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[Krastanov]

Thank you!