Golint contentstream draw

[adrg]

Addresses #422

[codecov]

Codecov Report

Merging #426 into v3 will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##               v3     #426   +/-   ##
=======================================
  Coverage   59.47%   59.47%           
=======================================
  Files         153      153           
  Lines       27711    27711           
=======================================
  Hits        16482    16482           
  Misses      10762    10762           
  Partials      467      467

Impacted Files	Coverage Δ
pdf/contentstream/draw/bezier_curve.go	91.01% <ø> (ø)	⬆️
pdf/contentstream/draw/vector.go	0% <ø> (ø)	⬆️
pdf/contentstream/draw/path.go	66.03% <ø> (ø)	⬆️
pdf/contentstream/draw/shapes.go	72.59% <ø> (ø)	⬆️
pdf/contentstream/draw/point.go	60% <ø> (ø)	⬆️

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