Support multiple countryCodes

[mihneadb]

Right now one has to choose between either a specific country or ALL for countryCode. Would be nice to support a list of codes, like what the other configs do.

[missinglink]

👍 sounds good, we'd be happy to accept a PR which allows an array of country codes.
It would need to be backwards compatible so that either a string or an array of strings was allowed.

For now, the workaround is to run the download and import steps once per countrycode