Add old project URL to README

Author: withoutwax

README.md

@@ -72,3 +72,5 @@ The build is minified and the filenames include the hashes.
 Your app is ready to be deployed!
 
 See the section about [deployment](https://facebook.github.io/create-react-app/docs/deployment) for more information.
+
+Old project URL: https://withoutwax.github.io/Liar-Game/