code: public ItemRequest<Task> delete(String task) {
      
          String path = String.format("/tasks/%s", task);
          return new ItemRequest<Task>(this, Task.class, path, "DELETE");
      }
docs: A specific, existing task can be deleted by making a DELETE request on the
  URL for that task. Deleted tasks go into the "trash" of the user making
  the delete request. Tasks can be recovered from the trash within a period
  of 30 days; afterward they are completely removed from the system.
  
  Returns an empty data record.
  
  @param  task The task to delete.
  @return Request object