Chat.py avatar URL deprecated

[StickFlick]

Looks like this one snuck up on ya again:

was noted in Chat stops working #54 but it looks like they changed it again and an update erased your previous change.

This will cause the exact same error to appear. After some digging I found it is fixed now if you change it from this:

avatar_url = member.avatar_url

to this:

avatar_url = member.avatar

[JonnyPtn]

The python version of this bot is deprecated now so I'll close this, but syncing avatars is working well in the new version on the main branch