Check for local replace directives

[ryancurrah]

Resolves #2

[codecov]

Codecov Report

Merging #6 (66d4db1) into master (2615509) will decrease coverage by 1.67%.
The diff coverage is 96.66%.

@@            Coverage Diff             @@
##           master       #6      +/-   ##
==========================================
- Coverage   66.78%   65.10%   -1.68%     
==========================================
  Files           2        2              
  Lines         283      278       -5     
==========================================
- Hits          189      181       -8     
- Misses         94       97       +3     

Flag	Coverage Δ
unittests	65.10% <96.66%> (-1.68%)	⬇️

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Impacted Files	Coverage Δ
gomodguard.go	71.77% <96.00%> (-3.23%)	⬇️
cmd.go	55.65% <100.00%> (+1.59%)	⬆️

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