title: Firebase returning Optional() with Swift 3.0
body: <p>This code is now displaying data in the app as Optional('data') since updating to Swift 3.0. Any idea? </p>
  
  <pre><code>let ring1FightRef = FIRDatabase.database().reference().child("Ring1Fighting")
  
  
  @IBOutlet weak var ring1Fighting: UILabel!
  </code></pre>
  
  <p>Here is the code in viewDidLoad</p>
  
  <pre><code>ring1FightRef.observe(.value) { (snap: FIRDataSnapshot) in self.ring1Fighting.text = (snap.value as AnyObject).description
      }
  </code></pre>