**UPDATE LOG**
Version 2.0.0:
the 2.0.0 version of my plugin now includes a config file where you can change the messages when you type /setspawn and /spawn. If you changed the config you don't have to restart the server, just type /reloadspawntp (permission: SpawnTP.reload). Because of this update that added the config file you don't have to keep setting the spawn (with /setspawn). The plugin will now simply remember it even after a restart!