Make goreport happy

[arkady-emelyanov]

applying ineffassign, gofmt and misspell suggested fixes (formatting, unused vars, etc..)

[codecov]

Codecov Report

Merging #6 into master will decrease coverage by -0.14%.
The diff coverage is 95%.

@@            Coverage Diff            @@
##           master      #6      +/-   ##
=========================================
- Coverage   89.64%   89.5%   -0.14%     
=========================================
  Files           7       7              
  Lines         309     305       -4     
=========================================
- Hits          277     273       -4     
  Misses         19      19              
  Partials       13      13

Impacted Files	Coverage Δ
pkg/kubectl/types.go	100% <ø> (ø)	✅
pkg/kubectl/command.go	77.77% <100%> (ø)	✅
pkg/reference/garbage.go	100% <100%> (ø)	✅
pkg/kubectl/helpers.go	75% <100%> (ø)	✅
pkg/kubectl/api.go	91.66% <100%> (ø)	✅
pkg/reference/decoder.go	100% <100%> (ø)	✅
pkg/kubectl/parser.go	78.75% <50%> (ø)	✅

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