errors: captures error message fields in struct

[santhosh-tekuri]

closes Issue #44

[codecov-commenter]

Codecov Report

Base: 91.66% // Head: 91.66% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (be93380) compared to base (2dc9222).
Patch coverage: 96.96% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #99      +/-   ##
==========================================
- Coverage   91.66%   91.66%   -0.01%     
==========================================
  Files          10       10              
  Lines        2545     2542       -3     
==========================================
- Hits         2333     2330       -3     
  Misses        164      164              
  Partials       48       48              

Impacted Files	Coverage Δ
output.go	0.00% <0.00%> (ø)
errors.go	85.29% <100.00%> (+0.21%)	⬆️
extension.go	14.81% <100.00%> (ø)
schema.go	98.69% <100.00%> (-0.01%)	⬇️

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[akshetpandey]

@santhosh-tekuri : What is needed to land this diff? I can help.

[santhosh-tekuri]

@akshetpandey
you can use v6.0.0-alpha.1 if you need this change.

currently I am porting this to rust https://github.com/santhosh-tekuri/boon and found some bugs and some improvements which also require incompatible changes.

so I am holding on so that I can do all incompatible changes in single major release.