componentWillMount () {
     firebase.messaging().requestPermissions()
     firebase.messaging().getToken().then((token) => {

     })
  }

componentWillMount () {
     firebase.messaging().requestPermissions()
     firebase.messaging().getToken().then((token) => {

     })
    }

    firebase.messaging().getInitialNotification()
    .then(payload => {
      console.log('getInitialNotification', payload)
      if (payload.slug != undefined) {
        this.props.navigation.navigate('notification');
      } else {

      }
    })

    firebase.messaging().onMessage((payload) => {
     if (!payload.opened_from_tray) {
      navigate(routes.Notification, 1)
     }
    })