Remove Go Report Card badge

[alessio]

Removed Go Report Card badge from README.

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 37.87%. Comparing base (2440bb7) to head (a4f681c).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #93   +/-   ##
=======================================
  Coverage   37.87%   37.87%           
=======================================
  Files           2        2           
  Lines          66       66           
=======================================
  Hits           25       25           
  Misses         41       41           

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