docs: public Observable<FeaturesResponseObject> listAsync(UUID appId, String versionId, ListFeaturesOptionalParameter listOptionalParameter) {
          return listWithServiceResponseAsync(appId, versionId, listOptionalParameter).map(new Func1<ServiceResponse<FeaturesResponseObject>, FeaturesResponseObject>() {
              @Override
              public FeaturesResponseObject call(ServiceResponse<FeaturesResponseObject> response) {
                  return response.body();
              }
          });
      }