code: public BoxRequestsFile.GetFileVersions getVersionsRequest(String id) {
          BoxRequestsFile.GetFileVersions request = new BoxRequestsFile.GetFileVersions(id, getFileVersionsUrl(id), mSession);
          return request;
      }
docs: Gets a request that retrieves the versions of a file
  
  @param id    id of the file to retrieve file versions for
  @return  request to retrieve versions of a file