Remove overriden createJSModules (#895)

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.

facebook/react-native@ce6fb33

Author: ptomasroos

android/app/src/main/java/com/microsoft/codepush/react/CodePush.java

@@ -302,11 +302,6 @@ public List<NativeModule> createNativeModules(ReactApplicationContext reactAppli
         return nativeModules;
     }
 
-    @Override
-    public List<Class<? extends JavaScriptModule>> createJSModules() {
-        return new ArrayList<>();
-    }
-
     @Override
     public List<ViewManager> createViewManagers(ReactApplicationContext reactApplicationContext) {
         return new ArrayList<>();