v2.1.0

This release brings a whole load of changes, please check the changelog on https://twitchio.readthedocs.org for a full list.

Major changes for this release include:

• Added the raw_usernotice event
• Added support for the predictions API
• added support for the schedules API
• Update the library to use the iso8601 library to parse timestamps
• fix Client.wait_for causing asyncio.InvalidState errors
• fix bug in ext.pubsub where Pool.unsubscribe_topics would error out due to an error
• fix bug in ext.eventsub where the ChannelBanData model would attempt to access nonexistent attributes from the event payload