update readme

Author: madhums

README.md

@@ -16,6 +16,8 @@ an article, delete an article and add comment on the article.
   $ npm start
 ```
 
+Then visit [http://localhost:3000/](http://localhost:4000/)
+
 ## Directory structure
 ```
 -app
@@ -28,7 +30,5 @@ an article, delete an article and add comment on the article.
   |__passport (auth config)
 ```
 
-Then visit [http://localhost:3000/](http://localhost:4000/)
-
 If you are looking a specific feature, please use the issue tracker. I will try to come
 up with a demo as earliest as I can. Please feel free to fork and send updates :)