docs: public void leave(String groupId, Boolean deletePhotos) throws FlickrException {
          Map<String, Object> parameters = new HashMap<String, Object>();
          parameters.put("method", METHOD_LEAVE);
          parameters.put("group_id", groupId);
          parameters.put("delete_photos", deletePhotos);
  
          Response response = transportAPI.post(transportAPI.getPath(), parameters, apiKey, sharedSecret);
          if (response.isError()) {
              throw new FlickrException(response.getErrorCode(), response.getErrorMessage());
          }
      }