Traceback (most recent call last):  File "/home/jbliss/miniconda3/envs/xonsh/lib/python3.6/site-packages/gitlab/objects.py", line 2141, in available    return json.dumps(ProjectService._service_attrs.keys())  File "/home/jbliss/miniconda3/envs/xonsh/lib/python3.6/json/__init__.py", line 231, in dumps    return _default_encoder.encode(obj)  File "/home/jbliss/miniconda3/envs/xonsh/lib/python3.6/json/encoder.py", line 199, in encode    chunks = self.iterencode(o, _one_shot=True)  File "/home/jbliss/miniconda3/envs/xonsh/lib/python3.6/json/encoder.py", line 257, in iterencode    return _iterencode(o, 0)  File "/home/jbliss/miniconda3/envs/xonsh/lib/python3.6/json/encoder.py", line 180, in default    o.__class__.__name__)TypeError: Object of type 'dict_keys' is not JSON serializable