added one more line in demo

Author: yeshaokai

notebooks/MABe_demo.ipynb

@@ -679,6 +679,7 @@
     "from copy import deepcopy\n",
     "new_config = deepcopy(config)\n",
     "#new_config['video_info']['video_file_path'] =  'new movie file'\n",
+    "#new_config['keypoint_info']['keypoint_file_path'] =  'new keypoint file'\n",
     "\n",
     "qa_message = amadeus.run_task_program(new_config, 'get_watching_events')\n",
     "parse_result(amadeus, qa_message)"