Fix the codecov link in iron README

[christophfroehlich]

Fix the codecov link in iron README

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.01%. Comparing base (4941fee) to head (7149375).
Report is 2 commits behind head on iron.

Additional details and impacted files

@@             Coverage Diff             @@
##             iron    #1068       +/-   ##
===========================================
+ Coverage   47.46%   72.01%   +24.54%     
===========================================
  Files          40       40               
  Lines        3685     3505      -180     
  Branches     1758     1750        -8     
===========================================
+ Hits         1749     2524      +775     
+ Misses        722      683       -39     
+ Partials     1214      298      -916     

Flag	Coverage Δ
unittests	72.01% <ø> (+24.54%)	⬆️

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see 34 files with indirect coverage changes