title: Discord.py - Changing prefix with command
body: <p>I want to make a command where an admin can change the prefix for commands (eg: instead of using "." they can change it to "-" and only "-" will work if they do) I'd be able to setup the permissions to make only admins able to use the command</p>
  
  <p>I've looked around, through the docs &amp; interwebs but haven't found anything and I haven't had any idea on how to do this</p>