Fix the codecov link in humble README

[christophfroehlich]

Fix the codecov link in humble README

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.57%. Comparing base (fff5896) to head (eca6459).
Report is 1 commits behind head on humble.

Additional details and impacted files

@@             Coverage Diff             @@
##           humble    #1069       +/-   ##
===========================================
+ Coverage   46.77%   72.57%   +25.80%     
===========================================
  Files          40       40               
  Lines        3731     3555      -176     
  Branches     1794     1788        -6     
===========================================
+ Hits         1745     2580      +835     
+ Misses        738      670       -68     
+ Partials     1248      305      -943     

Flag	Coverage Δ
unittests	72.57% <ø> (+25.80%)	⬆️

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see 34 files with indirect coverage changes