v2.1.2

1.Fixed AutoMessage cannot be sent when using webhook
2.Removed member_leave on driver role removal, removed member_accept and member_welcome on driver role addition, moved member_accept and member_welcome to be sent on member acceptance
3.Renamed config.team_update to config.member_accept, which is sent once the member is accepted
Hint: member_accept and member_welcome are both sent when member is accepted, member_leave is sent when member resigns or is dismissed