title: Uninstall and reinstall app causes duplicate push messages firebase
body: <p>I am receiving duplicate notification when I Uninstall and reinstall app,</p>
  
  <p>Ex I have version 2 of app register to get notifications from topic XXXX after that I will Uninstall app and Reinstall verion 3 APP subscribe to same XXXX topic 
  I am getting same notifications Twice.</p>
  
  <p>Is Firebase sends notifications for the older app?
  Any Suggestions how to handle this or how to clean up earlier session </p>
  
  <p>I am seeing same issue in Both iOS and Andriod</p>