refactor: move towards code quality A+

[rafamizes]

Closes #36

[codecov]

Codecov Report

Merging #37 (0631e61) into master (9a87170) will increase coverage by 1.29%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #37      +/-   ##
==========================================
+ Coverage   92.00%   93.29%   +1.29%     
==========================================
  Files           9        9              
  Lines         200      194       -6     
==========================================
- Hits          184      181       -3     
+ Misses         16       13       -3     

Impacted Files	Coverage Δ
lib/src/core/basic_text_field.dart	92.00% <ø> (ø)
lib/src/core/well_formed.dart	73.17% <ø> (ø)
lib/src/brazil/cep_field.dart	100.00% <100.00%> (+5.88%)	⬆️
lib/src/brazil/cnpj_field.dart	100.00% <100.00%> (+5.55%)	⬆️
lib/src/brazil/cpf_field.dart	100.00% <100.00%> (+5.55%)	⬆️

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[rafamizes]

@rultor merge it.

[rultor]

@rultor merge it.

@rafamizes OK, I'll try to merge now. You can check the progress of the merge here

[rultor]

@rultor merge it.

@rafamizes Done! FYI, the full log is here (took me 3min)