[minor] Use request.socket instead of request.connection

`request.connection` is deprecated.

Author: lpinca

doc/ws.md

@@ -86,8 +86,8 @@ is provided with a single argument then that is:
 - `info` {Object}
   - `origin` {String} The value in the Origin header indicated by the client.
   - `req` {http.IncomingMessage} The client HTTP GET request.
-  - `secure` {Boolean} `true` if `req.connection.authorized` or
-    `req.connection.encrypted` is set.
+  - `secure` {Boolean} `true` if `req.socket.authorized` or
+    `req.socket.encrypted` is set.
 
 The return value (`Boolean`) of the function determines whether or not to accept
 the handshake.

lib/websocket-server.js

@@ -225,7 +225,7 @@ class WebSocketServer extends EventEmitter {
       const info = {
         origin:
           req.headers[`${version === 8 ? 'sec-websocket-origin' : 'origin'}`],
-        secure: !!(req.connection.authorized || req.connection.encrypted),
+        secure: !!(req.socket.authorized || req.socket.encrypted),
         req
       };