feat(mover): ✨ implement moveY (vertical move up or down)

Doesn't appear to be working properly, bot assumes XZ is goal reached

lib/plugins/command.js

@@ -209,6 +209,10 @@ function command(username, message) {
                         case "closer":
                             subcommand("go follow close")
                             break
+                        case "up":
+                        case "down":
+                            cfg.plugins.mover.moveY(player.position)
+                            break
                         default:
                             subcommand("go follow once")
                     }