iOS App doesn't receive FCM message on restart

### What verion of RN and react-native-fcm are you running?
"react-native": "^0.36.0",
"react-native-fcm": "^2.5.2",

### What device are you using?
iOS10.1 simulator

### Steps to reproduce the problem
1. Install the app in the simulator
_can receive FCM message_
2. Kill the app in the simulator, the start it up again
_The app won't receive any FCM message_

##### fix
3. Minimise then maximise the app
_can receive FCM message again_

### Expected behaviour
How can we receive message on app restart without doing the min/maxing step(3)?