Removed AN, added BQ, CW, SX. Added states NL

The Netherlands Antilles was divided into Bonaire, Saint Eustatius and Saba (BQ, BES, 535), Curaçao (CW, CUW, 531) and Sint Maarten (Dutch part) (SX, SXM, 534). (https://www.iso.org/obp/ui/#iso:code:3166:AN)
Merge pull request #3 from erJasp/master

Removed AN, added BQ, CW, SX. Added states NL