Use gometalinter and fix linting errors

[andrewrynhard]

No description provided.

[codecov]

Codecov Report

Merging #11 into master will decrease coverage by 0.49%.
The diff coverage is 30.76%.

@@           Coverage Diff            @@
##           master     #11     +/-   ##
========================================
- Coverage    8.62%   8.13%   -0.5%     
========================================
  Files           2       2             
  Lines         116     123      +7     
========================================
  Hits           10      10             
- Misses        104     110      +6     
- Partials        2       3      +1

Impacted Files	Coverage Δ
conform/enforce.go	9.52% <30.76%> (-0.69%)	⬇️

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