expose iso3166 in the result

[zaggino]

Hi, we need to access the data in iso3166 to get the country_code from the result. Exposing the whole iso3166 would not break the API and is a bit more flexible for potential other needs.

[teddychan]

Sorry I can't merge this:

coz currently the function will only return

1. []
2. [element1, element2]
   so most obvious different between normal result and error result is
   result.length = 0 and result.length = 2
   i.e. reasonable that user use the result.length == 2 (or result.length > 0) to check if it’s valid
   therefore not recommended to merge this directly

You may forked it to support your own use case first.
but i will keep this as features request in v2 version