docs(examples): fix websocket example (#1170)

Author: chimurai

examples/websocket/index.html

@@ -23,7 +23,7 @@ <h2>WebSocket demo</h2>
 
     <p>
       Proxy <code id="codeblock-ws-location">ws://localhost:3000</code> ➡
-      <code>ws://ws.ifelse.io</code>
+      <code>ws://echo.websocket.org</code>
     </p>
 
     <fieldset id="configuration">

examples/websocket/index.js

@@ -8,7 +8,7 @@ const { createProxyMiddleware } = require('../../dist'); // require('http-proxy-
  * Configure proxy middleware
  */
 const wsProxy = createProxyMiddleware({
-  target: 'http://ws.ifelse.io',
+  target: 'https://echo.websocket.org',
   // pathRewrite: {
   //  '^/websocket' : '/socket',        // rewrite path.
   //  '^/removepath' : ''               // remove path.