minor error in the documentation

Hi, I was helping a friend setup your API and we spotted a rogue "new" keyword in the quickstart guide:

`client = **new** WarcraftClient("CLIENT_ID", "CLIENT_SECRET")`

Seems like a simple typo (it took us a couple minutes to find it after copy/pasting) but just wanted to bring it up.

P.S. Thanks for writing a great module! You saved us a lot of work.