The goal of this update was specifically to add support to have multiple leveling systems running simultaneously. This will allow you to have something like a combat exp leveling system separate from a chat level which is also separate from a combat level. This makes it more versatile for whatever other needs you may have. I've also added a built-in reload command that will reload the config files. Be careful, though, as I don't know what issues may arise from it.

• Added extra leveling systems! By turning this on in your config, you can have multiple leveling systems running at the same time, rather than just one set up by default. If you don't want to use this feature you don't have to touch anything, but if you do, it would be helpful to re-generate your config.yml and milstones.yml. A new "levelsystems.yml" will generate automatically.
  
  
• Started keeping track of config versions to make config updates easier.
  
  
• Added a reload command! Use /sl reload to reload the plugin! Note that this is only recommended to be used when nobody else is online or is actively doing things to receive experience, reloading may cause unforeseen issues and can potentially erase playerdata.