title: Firebase Dynamic Links not opening app on iOS 10
body: <p>I am just getting ready to release a new version of my app with Firebase Dynamic Links in. I implemented dynamic linking a couple of months ago, pre-iOS 10, and everything was working as expected. Now I have come to do some final tests, having built for iOS 10, I am having issues.</p>
  
  <ul>
  <li>If the app is installed on iOS 9 device, opening a dynamic link will take me to my app</li>
  <li>If the app is installed on iOS 10 device, however, opening the same dynamic link on iOS 10 will take me to my app's page in the App Store app (i.e. does not recognise it as installed).</li>
  </ul>
  
  <p>I am using the latest version of the Firebase iOS SDK (3.9.0), and using Testflight Beta build of the app (i.e. external tester).</p>
  
  <p>Anyone else seen this behaviour, or know of a solution?</p>