Renamed buildpacks command in error message
Renamed buildpacks command in error message

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