change to appropriate nickname command

✎ autoresponder commands

/autoresponder add trigger:.appnick reply:{requirearg:1|user}{setnick:an appropriate name!|[$1]}{sendto:#member-warnings} [$1], your nickname has been set to "an appropriate nickname" due to username inappropriacy. -- this moderation action was done by {user}.

/autoresponder editmatchmode trigger:.appnick matchmode:startswith

if a user's original user/nickname is too long, mimu will create an error to tell you that the nickname is too long and cannot be changed.