Update README.md

Author: jleal52

README.md

@@ -196,6 +196,7 @@ http.createServer(function (req, res) {
 * `error`: The error event is emitted if the request to the target fail.
 * `proxyRes`: This event is emitted if the request to the target got a response.
 * `proxySocket`: This event is emitted once the proxy websocket was created and piped into the target websocket.
+* `close`: This event is emitted once the proxy websocket was closed.
 
 ```js
 var httpProxy = require('http-proxy');
@@ -233,6 +234,14 @@ proxy.on('proxySocket', function (proxySocket) {
   // listen for messages coming FROM the target here
   proxySocket.on('data', hybiParseAndLogMessage);
 });
+
+//
+// Listen for the `close` event on `proxy`.
+//
+proxy.on('close', function (req, socket, head) {
+  // view disconnected websocket connections
+  console.log('Client disconnected');
+});
 ```
 
 #### Using HTTPS