Config Rework! You need to delete the config.yml file (or you can copy and paste what you have done). There are 3 new configuration files named: arena.yml, messages.yml, settings.yml. They will be automaticly generated. Please check the wiki if you have any question.
Added - Update Checker. If the version you are using on your server is not the latest version available, a message will be displayed in the console.
Added - settings.yml: check-for-updates
BugFix - It is no longer possible to send a request to yourself.