code: def onImageChange(
          self,
          mid=None,
          author_id=None,
          new_image=None,
          thread_id=None,
          thread_type=ThreadType.GROUP,
          ts=None,
          msg=None,
      ):
          
          log.info("{} changed thread image in {}".format(author_id, thread_id))
docs: Called when the client is listening, and somebody changes the image of a thread
  
          :param mid: The action ID
          :param author_id: The ID of the person who changed the image
          :param new_image: The ID of the new image
          :param thread_id: Thread ID that the action was sent to. See :ref:`intro_threads`
          :param thread_type: Type of thread that the action was sent to. See :ref:`intro_threads`
          :param ts: A timestamp of the action
          :param msg: A full set of the data recieved
          :type thread_type: models.ThreadType