title: onAppOpenAttribution not called for deep links with AppsFlyer
body: <p>I have integrated the AppsFlyer SDK into my project. I have managed to get deep links working. Any links I make in OneLink will open the app as desired. However I have no way to access the link parameters. I have implemented all the following delegate methods like so:</p>
  
  <pre><code>func onAppOpenAttribution(_ attributionData: [AnyHashable : Any]!) {
      print("Test 1")
  }
  
  func onAppOpenAttributionFailure(_ error: Error!) {
      print("Test 2")
  }
  
  func onConversionDataReceived(_ installData: [AnyHashable : Any]!) {
      print("Test 3")
  }
  
  func onConversionDataRequestFailure(_ error: Error!) {
      print("Test 4")
  }
  </code></pre>
  
  <p>Not one of them is called when my app is open from a deep link. What am I missing here? In my URL that is configured in the control panel I have <code>mycompany://</code> configured as the <code>Mobile deeplink URL</code>. Any pointers on this would be great. Thanks!</p>