Fix the unreachable test url

examples/async-std-echo.rs

@@ -5,12 +5,16 @@ use async_std::task;
 
 async fn run() -> Result<(), Box<dyn std::error::Error>> {
     #[cfg(any(feature = "async-tls", feature = "async-native-tls"))]
-    let url = "wss://echo.websocket.org";
+    let url = "wss://echo.websocket.events/.ws";
     #[cfg(not(any(feature = "async-tls", feature = "async-native-tls")))]
-    let url = "ws://echo.websocket.org";
+    let url = "ws://echo.websocket.events/.ws";
 
+    println!("Connecting: \"{}\"", url);
     let (mut ws_stream, _) = connect_async(url).await?;
 
+    let msg = ws_stream.next().await.ok_or("didn't receive anything")??;
+    println!("Received: {:?}", msg);
+
     let text = "Hello, World!";
 
     println!("Sending: \"{}\"", text);