title: Upgrading App to Swift 4 and iOS 11 - TwitterKit Issues
body: <p>I'm trying to upgrade my app to latest iOS support. I've added TwitterKit via CocoaPods, and placed header in my Bridge Header.  However; I am getting an error saying:</p>
  
  <blockquote>
    <p>Use of unresolved identified 'Twitter' - did you mean 'TWTRTTwitter'.</p>
  </blockquote>
  
  <pre><code>func application(_ application: UIApplication, didFinishLaunchingWithOptions lauunchOptions: [UIApplicationLaunchOptionsKey: Any]?) -&gt; Bool {
      Twitter.sharedInstance().start(withConsumerKey:"MYKEY", consumerSecret:"MYSECRET")
      return true
  }
  </code></pre>
  
  <p>This right out of the Twitter recommended code.  I also get it at:</p>
  
  <pre><code>func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any] = [:]) -&gt; Bool {
  
      let handled:Bool = true
  
      Twitter.sharedInstance().application(app, open: url, options: options)
  
      return handled
  }
  </code></pre>
  
  <p>Any pointers?</p>