resolved benign Go warnings

[drew-512]

Inserted non-affecting changes to resolve Go warnings

[codecov]

Codecov Report

Merging #153 (e867ef0) into master (965bc08) will decrease coverage by 0.00%.
The diff coverage is 53.84%.

@@ Coverage Diff @@## master #153 +/- ## ========================================== - Coverage 74.54% 74.54% -0.01%  ========================================== Files 64 64 Lines 11182 11178 -4 ========================================== - Hits 8336 8333 -3 - Misses 2296 2297 +1 + Partials 550 548 -2 

Impacted Files	Coverage Δ
compile/compile.go	90.56% <ø> (-0.01%)	⬇️
marshal/marshal.go	2.95% <0.00%> (ø)
py/code.go	11.90% <0.00%> (ø)
py/int.go	76.87% <0.00%> (-0.53%)	⬇️
py/method.go	70.52% <0.00%> (ø)
py/range.go	86.30% <ø> (-0.10%)	⬇️
py/bytes.go	28.07% <50.00%> (ø)
builtin/builtin.go	79.86% <100.00%> (+0.10%)	⬆️
parser/stringescape.go	100.00% <100.00%> (ø)
py/string.go	91.26% <100.00%> (-0.04%)	⬇️
... and 1 more

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[sbinet]

LGTM.