Fix issues and typos reported by Go Report Card

[maargenton]

No description provided.

[codecov-commenter]

Codecov Report

Merging #12 (cb811e3) into master (e855b62) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #12   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           23        23           
  Lines         1226      1225    -1     
=========================================
- Hits          1226      1225    -1     

Impacted Files	Coverage Δ
pkg/internal/builder/builder_api.go	100.00% <ø> (ø)
pkg/internal/predicate/impl/ext.go	100.00% <ø> (ø)
pkg/require/require.go	100.00% <ø> (ø)
pkg/value/field.go	100.00% <ø> (ø)
pkg/verify/verify.go	100.00% <ø> (ø)
pkg/prettyprint/token.go	100.00% <100.00%> (ø)

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