title: how to integrate UnityAds SDK in swift?
body: <p>When I call UnityAds.startWithGameId("") in the AppDelegate under: </p>
  
  <pre><code>application(application: UIApplication, didFinishLaunchingWithOptions
  </code></pre>
  
  <p>I get this error: 
  'UnityAds' does not conform to protocol 'StringLiteralConvertible'</p>
  
  <p>how can i fix it? thanks</p>