Remove override of createJSModules

Since of recently in master the unused createJSModules has been removed and ReactPackage's no longer contain the definition of createJSModules. There for it must be removed in order to not yield a compile error. This is breaking change.

https://github.com/facebook/react-native/commit/ce6fb337a146e6f261f2afb564aa19363774a7a8

android/src/main/java/com/evollu/react/fcm/FIRMessagingPackage.java

@@ -23,11 +23,6 @@ public class FIRMessagingPackage implements ReactPackage {
         return modules;
     }
 
-    @Override
-    public List<Class<? extends JavaScriptModule>> createJSModules() {
-        return Collections.emptyList();
-    }
-
     @Override
     public List<ViewManager> createViewManagers(ReactApplicationContext reactContext) {
         return Arrays.<ViewManager>asList();