feat: OnError - do a side effect

[Primetalk]

fix #55

[codecov]

Codecov Report

Merging #70 (57d93af) into master (d0201bf) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #70      +/-   ##
==========================================
+ Coverage   83.34%   83.38%   +0.04%     
==========================================
  Files          35       35              
  Lines        1573     1577       +4     
==========================================
+ Hits         1311     1315       +4     
  Misses        230      230              
  Partials       32       32              

Impacted Files	Coverage Δ
io/io.go	77.14% <100.00%> (+0.53%)	⬆️

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