add example for package gvalid

[gqcn]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.01 ⚠️

Comparison is base (a2fec50) 79.12% compared to head (7bf5394) 79.11%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2767      +/-   ##
==========================================
- Coverage   79.12%   79.11%   -0.01%     
==========================================
  Files         632      632              
  Lines       52008    52008              
==========================================
- Hits        41149    41148       -1     
- Misses       8824     8826       +2     
+ Partials     2035     2034       -1     

Flag	Coverage Δ
go-1.15-386	?
go-1.15-amd64	?
go-1.16-386	?
go-1.16-amd64	?
go-1.17-386	79.14% <ø> (+<0.01%)	⬆️
go-1.17-amd64	?
go-1.18-386	78.76% <ø> (+0.01%)	⬆️
go-1.18-amd64	78.75% <ø> (+0.01%)	⬆️
go-1.19-386	?
go-1.19-amd64	?
go-1.20-386	?
go-1.20-amd64	79.14% <ø> (+0.02%)	⬆️

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see 3 files with indirect coverage changes

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