option to block all replace

[carnott-snap]

In addition to the existing block.local_replace_directives, this change
allows checking for the addition of any replace clauses.

Close golangci/golangci-lint#1812

[codecov]

Codecov Report

Merging #8 (21aae6d) into master (1fc898b) will decrease coverage by 0.46%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master       #8      +/-   ##
==========================================
- Coverage   65.10%   64.64%   -0.47%     
==========================================
  Files           2        2              
  Lines         278      280       +2     
==========================================
  Hits          181      181              
- Misses         97       99       +2     

Flag	Coverage Δ
unittests	64.64% <0.00%> (-0.47%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
gomodguard.go	70.90% <0.00%> (-0.88%)	⬇️

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[ryancurrah]

This has been implemented as a new linter, gomoddirectives in golangci-lint as well. https://github.com/ldez/gomoddirectives