updating README example: cookie jar api changed cookie module changed…

… to tough-cookie

README.md

@@ -357,7 +357,7 @@ OR
 ```javascript
 var j = request.jar()
 var cookie = request.cookie('your_cookie_here')
-j.add(cookie)
+j.setCookie(cookie, uri)
 request({url: 'http://www.google.com', jar: j}, function () {
   request('http://images.google.com')
 })