feat (Payment card): sort results

feat (Payment Card): Add method to format payment card based on its s…

…tructure

fix: lint and doc

feat (ABA): Add methods to validate or compute things on ABARTN

feat(IBAN): Rename GetCheckDigits to GetIBANCheckDigits

fix: gofmt fixs

doc: Update README.md

feat-refactor: Change IsIBANValid signature

refactor-test: Add comments, factorise some codes and add new unit tests

feat: Add experimental IBAN countries