Countries API - add 3 letter iso code to response (minor thing)

[nanometrenat]

One for the list when someone gets a moment

The Countries admin page has fields for both iso (2 letter code) and iso3 (3 letter code), however the API (https://goadmin.ifrc.org/api/v2/country/) returns only the 2 letter one.

Can you please also make sure the 3 letter one is returned? Will help us with lookups to other sources.

Thanks

[nanometrenat]

In production now