Bot is now extended as Hitomi, so that we can add on_message_handlers =
[], which will store functions to call when on_message happens. this is
necessary because i want to have two things react to on_message, but the
discord.py code only supports one coroutine for on_message. so, this is
a hook into it to do what i want
not sure if i'll end up needing this for on_message_edit or
on_message_delete, but i'm skeptical right now
Brian S. Stephan