The api endpoint for euw was changed

Hi Trevor,
i was confused the whole morning why my old go-project wasn't working anymore, but your tests were okay.
The EUW point was changed from BaseURL = "https://prod.api.pvp.net/api" zu BaseURL = "euw.api.pvp.net/api" and so on. The baseUrl for the other servers will be also changed in the future but at the moment a query for na server can also be served by prod.api.pvp.net.
I hope my change is useful (your tests are still full functional)
Thank you for your work :)