- [ ] Added new message types to `telegram.Message.effective_attachment`
- [ ] Added new handlers for new update types
    - [ ] Added the handlers to the warning loop in the [`telegram.ext.ConversationHandler`](https://python-telegram-bot.readthedocs.io/en/stable/telegram.ext.conversationhandler.html)
- [ ] Added new filters for new message (sub)types
- [ ] Added or updated documentation for the changed class(es) and/or method(s)
- [ ] Added the new method(s) to `_extbot.py`
- [ ] Added or updated `bot_methods.rst`
- [ ] Updated the Bot API version number in all places: `README.rst` (including the badge) and `telegram.constants.BOT_API_VERSION_INFO`
- [ ] Added logic for arbitrary callback data in `telegram.ext.ExtBot` for new methods that either accept a `reply_markup` in some form or have a return type that is/contains [`telegram.Message`](https://python-telegram-bot.readthedocs.io/en/stable/telegram.message.html)