Added validation regex for Argentina license plates whose format can be AB 123 CD or ABC 123.

Checklist

• PR contains only changes related; no stray files, etc.
• README updated (where applicable)
• Tests written (where applicable)

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (3476598) compared to base (531dc7f).
Patch coverage: 100.00% of modified lines in pull request are covered.

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+ Hits          2308      2309    +1     

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Do you have a source on this?

I live in Argentina, couldn't find any "official" source, but here is a wikipedia article: https://en.wikipedia.org/wiki/Vehicle_registration_plates_of_Argentina

This validator supports:

• The old format "ABC 123" (specific for Argentina) that it's still valid but not issued anymore and;
• The new format "AB 123 CD" which is the current Argentine standard (actually is the standard for all the Mercosur countries).

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