Update sbt-extras
Update sbt-extras

yannickdeturck/heroku-buildpack-scala,Javilete/buildpack,Scalingo/scala-buildpack,phdezann/heroku-buildpack-scala,Scalingo/scala-buildpack,heroku/heroku-buildpack-scala,hpcloud/heroku-buildpack-scala,hpcloud/heroku-buildpack-scala,phdezann/heroku-buildpack-scala,agideon/heroku-buildpack-scala,KimStebel/heroku-buildpack-scala,KimStebel/heroku-buildpack-scala,heroku/heroku-buildpack-scala,Javilete/buildpack,agideon/heroku-buildpack-scala,yannickdeturck/heroku-buildpack-scala