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fix/unknown-country-validation (#51)

* Fix issues with validateIBAN and unknown countries

- Fixes validateIBAN so unsupported countries like US are treated the same as unknown countries like XX (just like isValidIBAN)
- Validate the checksum for unsupported/unknown countries

fixes #50

* Add checksum

Co-authored-by: Saša Jovanić <Simplify@users.noreply.github.com>

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