Update the websocket server to wss://ws.postman-echo.com/raw from wss://echo.websocket.org since the latter no longer exists.

websockets/README.md

@@ -1,6 +1,6 @@
 # WebSockets - [Live Demo](https://ellie-app.com/8yYgw7y7sM2a1)
 
-This is a minimal example of how to connect to a WebSocket. It connects to `wss://echo.websocket.org` which just repeats whatever you say.
+This is a minimal example of how to connect to a WebSocket. It connects to `wss://ws.postman-echo.com/raw` which just repeats whatever you say.
 
 ![Demo](demo.gif)
 

websockets/index.html

@@ -19,7 +19,7 @@
 });
 
 // Create your WebSocket.
-var socket = new WebSocket('wss://echo.websocket.org');
+var socket = new WebSocket('wss://ws.postman-echo.com/raw');
 
 // When a command goes to the `sendMessage` port, we pass the message
 // along to the WebSocket.