* Run pre commit hook tests on all platforms TEMPORARILY
* Use os.system instead of subprocess.call
* Turn on branch coverage
* Let's try this then
* More testing!
* Update test_meta.py
Required fixes:
- CallbackQuery is now comparable.
- Message.effective_attachment, Message.photo,
Message.new_chat_members, Message.new_chat_photo &
Game.text_entitties semantic fixes - when they are not defined,
return an empty list.
- Docstring fix to Update class.
