Add support for Partial IBAN Countries

[yaxirpaxha]

Hi..!
Project currently supports national IBAN formats of those countries that are compliant with the ISO 13616 standard (Published by SWIFT). But there are some partial IBAN countries (many banks work with them) needs to be added in lib.

For reference please see --> https://www.iban.com/structure.html

[barend]

Thanks for the link. I'll take it into consideration next time I work on this.