Update code-of-conduct.md

[spiffxp]

Refer to kubernetes/community as authoritative source for code of conduct

ref: kubernetes/community#1527

[codecov-io]

Codecov Report

Merging #409 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #409   +/-   ##
=======================================
  Coverage   84.47%   84.47%           
=======================================
  Files          26       26           
  Lines        1462     1462           
=======================================
  Hits         1235     1235           
  Misses        176      176           
  Partials       51       51

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[prydonius]

Thanks @spiffxp!