My apologies for the quick, successive update. This new release now adds the ability for the plugin to check whether it is up to date and notifies you in the console and to certain players if they have the appropriate permission node.
If you discover any other issues with the plugin, please do send me a message or leave a post on the forum post with your issue and I'll try my best to assist you.
Added a plugin version update checker.
Added a new permission 'SpeedLimit.update', this notifies players when an update is available.