Additions
- `User.` and `Viewer.login`, which do the same as `.username`, just with Twitch's naming convention
- The `reply_to` kwarg in `TwitchClient.create_message`, and the `reply` kwarg in `Message.respond`, which allow the bot to reply to users
Breaking changes
- `User.` and `Viewer.broadcaster_type` are now of type `BroadcasterType` (which is an enum) rather than of type string