0.43

• Removed users and chat methods, notifications and types (the features will undergo changes in the future):
  • get_users
  • send_message
  • mark_as_read
  • get_rooms
  • get_room_history_from_message
  • get_room_history_from_timestamp
  • update_room
  • Presence
  • UserInfo
  • Room
  • Message
• Added create_task method.
• WindowsProactorEventLoopPolicy is used on Windows.