Update app.js

app.js

@@ -28,7 +28,7 @@ app.get('/', (req, res) => {
     function joinRoom() {
     try {
       const roomId = document.getElementById('room').value;
-      ws = new WebSocket('ws://' + location.host);
+      ws = new WebSocket('wss://' + location.host);
       ws.onopen = () => {
         ws.send(JSON.stringify({ action: 'join', roomId }));
         currentRoom = roomId;