Update pyChatGPT.py

[Kolhax]

fix:
#151

[shijiale0609]

Here is what I find a new error report.

ValueError Traceback (most recent call last)
Cell In[2], line 1
----> 1 resp = api.send_message("Hello, tell me three jokes")

File ~\anaconda3\envs\openai\lib\site-packages\pyChatGPT\pyChatGPT.py:476, in ChatGPT.send_message(self, message, stream)
474 return {'message': content, 'conversation_id': conversation_id}
475 else:
--> 476 raise ValueError('Could not extract conversation ID')

ValueError: Could not extract conversation ID