code: public Release rollback(String appName, String releaseUuid) {
          return connection.execute(new Rollback(appName, releaseUuid), apiKey);
      }
docs: Rollback an app to a specific release.
  @param appName App name. See {@link #listApps} for a list of apps that can be used.
  @param releaseUuid Release UUID. See {@link #listReleases} for a list of the app's releases.
  @return the release object