Waiting for #4912 to add new Enums so I can reference the constant in the bot methods.

Check-list for PRs

• Added .. versionadded:: NEXT.VERSION, .. versionchanged:: NEXT.VERSION, .. deprecated:: NEXT.VERSION or ``.. versionremoved:: NEXT.VERSION` to the docstrings for user facing changes (for methods/class descriptions, arguments and attributes)
• Created new or adapted existing unit tests
• Documented code changes according to the CSI standard
• Added myself alphabetically to AUTHORS.rst (optional)
• Added new classes & modules to the docs and all suitable __all__ s
• Checked the Stability Policy in case of deprecations or changes to documented behavior

If the PR contains API changes (otherwise, you can ignore this passage)

• Checked the Bot API specific sections of the Stability Policy

• Created a PR to remove functionality deprecated in the previous Bot API release (see here)

• New Classes

  • Added self._id_attrs and corresponding documentation
  • __init__ accepts api_kwargs as keyword-only

• Added New Shortcuts

  • In telegram.Chat & telegram.User for all methods that accept chat/user_id
  • In telegram.Message for all methods that accept chat_id and message_id
  • For new telegram.Message shortcuts: Added quote argument if methods accept reply_to_message_id
  • In telegram.CallbackQuery for all methods that accept either chat_id and message_id or inline_message_id

• If Relevant

  • Added new constants at telegram.constants and shortcuts to them as class variables
  • Linked new and existing constants in docstrings instead of hard-coded numbers and strings
  • 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
  • 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