Enable & fix lint

[DonRenando]

#59 fix lint issues from golangci-lint

[codecov-commenter]

Codecov Report

Merging #60 (edac7ae) into master (2bedbed) will decrease coverage by 0.87%.
The diff coverage is 31.57%.

@@            Coverage Diff             @@
##           master      #60      +/-   ##
==========================================
- Coverage   42.67%   41.80%   -0.88%     
==========================================
  Files          15       15              
  Lines         478      488      +10     
==========================================
  Hits          204      204              
- Misses        261      267       +6     
- Partials       13       17       +4     

Impacted Files	Coverage Δ
model/config.go	0.00% <0.00%> (ø)
model/maintainer.go	59.78% <ø> (ø)
model/util.go	0.00% <0.00%> (ø)
store/datastore/users.go	100.00% <ø> (ø)
cache/helper.go	86.20% <33.33%> (-13.80%)	⬇️
store/datastore/repos.go	80.55% <100.00%> (ø)

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[techknowlogick]

Thanks :)