title: Invalidate Firebase Token on Logout (React Native Firebase)
body: <p>What is the correct way to invalidate a firebase token on react-native-firebase when user logs out?</p>
  
  <p>Firebase's <a href="https://firebase.google.com/docs/reference/android/com/google/firebase/iid/FirebaseInstanceId.html#deleteInstanceId()" rel="noreferrer">deleteInstanceId</a> isn't available in react-native-firebase. </p>
  
  <p>In the Github issues, the following method was suggested: <code>firebase.iid().delete()</code>
  However, after using this method once, I wasn't able to get the user to continue receiving notifications (using a newly generated firebase token) -- and the only way to start receiving firebase messages again, was to delete the app </p>
  
  <p>This behavior happened on both iOS and Android.</p>
  
  <p>The reason I want to invalidate the token upon logout -- is to make sure that this device will not receive notifications that are only intended for the user to see when logged-in</p>