Client created with from_client_credentials doesn't work

[iarspider]

I was trying to get Client to auto-refresh the token, but stumbled upon a few issues:

1. Client.from_client_credentials(...).start() raises AuthenticationError. The actual exception is raised inside self._client._http.validate, which can't handle the situation when both token and self.token are None. The fix is easy:

   async def validate(self: twitchio.http.TwitchHTTP, *, token: str = None) -> dict:
   if not token:
   # add these two lines:
       if self.token is None:
           await self._generate_login()
       token = self.token

2. But even fixing that is not enough: for application tokens (generated by _generate_login) the response of /oauth2/validate does not contain login or user_id - which WSConnection._connect(...) expects.

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[IAmTomahawkx]

This is expected behaviour. You cannot log into chat with a client credential token