add .golangci.yml

[vtopc]

closes #16

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.38%. Comparing base (15484cf) to head (ad4e3d8).

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #19   +/-   ##
=======================================
  Coverage   90.38%   90.38%           
=======================================
  Files           6        6           
  Lines          52       52           
=======================================
  Hits           47       47           
  Misses          3        3           
  Partials        2        2           

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