bump go report to show A+ instead of C, lint README.md

[piotrostr]

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Merging #893 (5570438) into master (b74068d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #893   +/-   ##
=======================================
  Coverage   98.53%   98.53%           
=======================================
  Files          30       30           
  Lines        1163     1163           
=======================================
  Hits         1146     1146           
  Misses         11       11           
  Partials        6        6           

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[sywhang]

Thanks for the contribution!