Update README.md (#51)

Author: Justin Martin

README.md

@@ -9,7 +9,7 @@ http://json-diff.com
 2. cd to the repo directory
 3. run `npm install`
 4. run `npm start`
-5. go to [http://localhost:3000](http://localhost:5000)
+5. go to [http://localhost:5000](http://localhost:5000)
 
 ## Contribute
 [Check out the contributing.md file](https://github.com/justspamjustin/online-json-diff/blob/master/CONTRIBUTING.md)