Android compile error

Hi @evollu

My iOS version works fine. But my android compile give a error:

```
:react-native-fcm:compileReleaseJavaWithJavac - is not incremental (e.g. outputs have changed, no previous execution, etc.).
/Users/robertarissen/Desktop/Dev/Apps/sponsorij/node_modules/react-native-fcm/android/src/main/java/com/evollu/react/fcm/FIRMessagingPackage.java:13: error: FIRMessagingPackage is not abstract and does not override abstract method createJSModules() in ReactPackage
public class FIRMessagingPackage implements ReactPackage {
^
1 error
:react-native-fcm:compileReleaseJavaWithJavac FAILED

FAILURE: Build failed with an exception.
```

How can I fix this?
```
"react-native": "0.45.1",,
"react-native-fcm": "^8.0.0",
```