React Native v.0.51 compatibility

[sytolk]

This is removed in new RN versions

  @Override
   public List<Class<? extends JavaScriptModule>> createJSModules() {
       return Collections.emptyList();
}

Gradle build error:

app/node_modules/react-native-couchbase-lite/android/src/main/java/me/fraserxu/rncouchbaselite/ReactCBLiteManager.java:15: error: method does not override or implement a method from a supertype
    @Override
    ^
 FAILED
1 error