title: Is there any callback that notifies once the app is updated to a new version in iOS
body: <p>I need to migrate my app after each version update. I am currently doing this while the app is launched after the update(i.e in application: didFinishLaunchingWithOptions)</p>
  
  <p>If the user has turned on the Automatic updates for apps, app may remain in active state during and after the update. And so i cannot migrate the app immediately. is there any call back from application once the update is completed ?</p>