title: Push notifications in ionic3?
body: <p>I have been trying to implement registering and receiving push notifications in 
  my ionic3 app fro the past 2 days but nothing seems working because of the version that I am using right now.</p>
  
  <p>First of all my versions;</p>
  
  <p>rxjs : 5.5.11</p>
  
  <p>Angular : 5.2.11</p>
  
  <p>typescript : ~2.6.2</p>
  
  <p>firebase : 5.8.2</p>
  
  <p>@angular/fire: ^5.1.1</p>
  
  <p>angularfire2 : ^5.1.1</p>
  
  <p>Things that I have tried so far:</p>
  
  <p>1)AngularFirestore-Firebase Native</p>
  
  <p>I am getting Object(...) is not function error with this and I realized this because of my rxjs version. AngularFireStore is using rxjs 6 or above. I updated rxjs to 6 but this time typescrit gave error. Because rxjs was using ts 2.8 features. I wanted update ts but ionic was not supporting it. I don't want to migrate to ionic4 becaasu I don't want to spend time for this.</p>
  
  <p>2)ionic-push</p>
  
  <p>I am getting the same Object(...) is not a function error again.</p>
  
  <p>3) FCM</p>
  
  <p>Strange enough, I can not put FCM to the providers in the app.module.ts. Ts giving error that FCM is not suitable to be a provider.</p>
  
  <p>So I need a way to implement push notifications with the package versions that I am using right now? Thanks in Advance!</p>