Version 12.8

Released 2020-06-22

Major Changes:

• Remove Python 2 support (#1715)
• Bot API 4.9 support (#1980)
• IDs/Usernames of Filters.user and Filters.chat can now be updated (#1757)

Minor changes, CI improvements, doc fixes or bug fixes:

• Update contribution guide and stale bot (#1937)
• Remove NullHandlers (#1913)
• Improve and expand examples (#1943, #1995, #1983, #1997)
• Doc fixes (#1940, #1962)
• Add User.send_poll() shortcut (#1968)
• Ignore private attributes en TelegramObject.to_dict() (#1989)
• Stabilize CI (#2000)