Update README.md

Fix URL for app

Author: mdbecker

README.md

@@ -43,4 +43,4 @@ port, then set `PORT` in the `.env` file.
 ## Deployment
 **Before you push your changes to master make sure that everything works in development mode.**
 
-Changes merged to `master` will be automatically deployed to [pennchime.herokuapp.com](http://predictivehealthcare.pennmedicine.org/chime).
+Changes merged to `master` will be automatically deployed to [http://penn-chime.phl.io/](http://predictivehealthcare.pennmedicine.org/chime).