[Added] Update Currency Codelist to show VES - Bolivar Soberano

We are updating the IATI Currency Codelist to bring it in line with changes to the ISO 4217 Currency codelist: http://www.iso.org/iso/home/standards/currency_codes.htm

Notable changes are:

VER - Bolivar has been withdrawn

The new code VES has been added: VES - Bolivar Soberano

See the relevant pull request here