.warn <user> [<reason>]
Adds a warning to the user. If no reason is specified, 'warned by devmod' is used.
The warning is logged in channels.warn.
If autoBan is true and the user's warnings after this one are equal to autoBanWarns,
the user will be banned, their messages from the path banMsgDelete days, and the ban
will be logged to channels.ban.
You can clear a user's warnings with the clear warns command.
You can list a user's warnings with the warns command.
['KICK_MEMBERS']