Shopify/active_merchant — pull request #1139 by rwdaigle (2014-04-24 15:02:33+00:00)
Title: iATS: Fix invalid country code UK -> GB

Fixes erroneous country code. United Kingdom is really `GB`, not `UK`. Tricky!

@ntalbott I'd like to add this supported country code test to the gateway generator to avoid this in the future:

```ruby
def test_supported_countries
@gateway.supported_countries.each do |country_code|
assert ActiveMerchant::Country.find(country_code), "Supported country code #{country_code} is invalid. Please use a value explicitly listed in active_utils' ActiveMerchant::Country class."
end
end
```

If you think this is sane let me know and I'll add a separate PR.