Heroku Changelog SBT 0.13.0 and Play 2.2.0 Support

Change effective on 26 September 2013

Heroku now supports SBT 0.13.0 for Scala. Set sbt.version=0.13.0 in your project’s /project/build.properties file to upgrade. Play 2.2.0 is also supported with this update. See Play Framework Support for more information.