code: public BoxRequestsFile.UpdateFile getRenameRequest(String id, String newName) {
          BoxRequestsFile.UpdateFile request = new BoxRequestsFile.UpdateFile(id, getFileInfoUrl(id), mSession);
          request.setName(newName);
          return request;
      }
docs: Gets a request that renames a file
  
  @param id        id of file to rename
  @param newName   id of file to retrieve info on
  @return      request to rename a file