title: setStatusBarHidden(_:withAnimation:) deprecated in iOS 9
body: <p>I see that in iOS 9 <code>setStatusBarHidden(_:withAnimation:)</code> is now deprecated and the documentation says to use <code>[UIViewController prefersStatusBarHidden]</code> instead but what is the alternative in iOS 9 if I still want to hide the status bar with a slide animation?</p>