send a message on disconnect of users.

js/babl/server.js

@@ -19,6 +19,15 @@ wss.on('connection', function(ws) {
		wss.broadcast(msg);
	});
	ws.on('close', function() {
		var msg = {
			type: "disconnect",
			author: name,
			timestamp: Date.now()
		};
		wss.broadcast(msg);
	});
});
function randomName() {