Update README with new demo URL

Author: vjo

README.md

@@ -2,8 +2,8 @@ MapMyCheckins
 =============
 
 Side project to discover FourSquare API and playing with Sinatra.
-Demo: https://calm-bastion-1929.herokuapp.com/
+Demo: http://foursqmap.herokuapp.com/
 
 This app display your FourSquare checkins on Google Maps.
 
-![Screenshot](https://github.com/vjo/MapMyCheckins/raw/master/screenshot.png)
+![Screenshot](https://github.com/vjo/MapMyCheckins/raw/master/screenshot.png)