[minor] Silence deprecation warning

Fixes #1829

Author: lpinca

lib/websocket.js

@@ -695,7 +695,7 @@ function tlsConnect(options) {
   options.path = undefined;
 
   if (!options.servername && options.servername !== '') {
-    options.servername = options.host;
+    options.servername = net.isIP(options.host) ? '' : options.host;
   }
 
   return tls.connect(options);

test/websocket.test.js

@@ -2123,7 +2123,7 @@ describe('WebSocket', () => {
       });
 
       server.listen(0, () => {
-        const ws = new WebSocket(`wss://localhost:${server.address().port}`, {
+        const ws = new WebSocket(`wss://127.0.0.1:${server.address().port}`, {
           rejectUnauthorized: false
         });
       });