Through all the versions we've acquired a lot of deprecated code, left intact for backwards compatibility. Here an overview so we won't leave them in forever (between parentheses the first release with the deprecation warning):

Group 1 (#564)

• Non-PEP8 dispatcher methods (v4)
• Non-PEP8 method names in all telegram.ext.*handler.py files (v4)
• Check examples for deprecated code usage

Group 2 (at around 7.0)

• Botan import from utils (v5)
• telegram.Emoji (v5.1)
• ReplyKeyboardHide (v5.3)
• edit_message in setGameScore (v5.3)
• Remove usage of deprecated code in tests.