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Update changelog [skip ci]
zunda/heroku-buildpack-ruby,dieze/heroku-buildpack-ruby-hooks,vhx/heroku-buildpack,donnykurnia/heroku-buildpack-ruby,ekaranto/rails4-bluemix-buildpack,ekaranto/rails4-bluemix-buildpack,tpope/heroku-buildpack-ruby-tpope,tenjikinc/heroku-buildpack-ruby,orlando/heroku-buildpack-ruby,dieze/heroku-buildpack-ruby-hooks,ericboehs/heroku-buildpack-ruby,andycroll/heroku-buildpack-jekyll,Scalingo/ruby-buildpack,orenyk/heroku-buildpack-ruby,cloudfoundry/ruby-buildpack,markaschneider/heroku-buildpack-ruby-ffmpeg-sox,bwaite-jaroop/heroku-buildpack-ruby,cloudfoundry/ruby-buildpack,andycroll/heroku-buildpack-jekyll,orlando/heroku-buildpack-ruby,jumptvs/BP_Ruby,Genius/heroku-buildpack-ruby,makifund/heroku-buildpack-ruby,cloudfoundry/ruby-buildpack,cordata/heroku-buildpack-ruby,makifund/heroku-buildpack-ruby,tenjikinc/heroku-buildpack-ruby,markaschneider/heroku-buildpack-ruby-ffmpeg-sox,ekaranto/rails4-bluemix-buildpack,jumptvs/BP_Ruby,pilotcreative/heroku-buildpack-ruby,pilotcreative/heroku-buildpack-ruby,bwaite-jaroop/heroku-buildpack-ruby,donnykurnia/heroku-buildpack-ruby,heroku/heroku-buildpack-ruby,mattmanning/heroku-buildpack-ruby-jekyll,tpope/heroku-buildpack-ruby-tpope,zoomer/heroku-buildpack-ruby-bower,jumptvs/BP_Ruby,ekaranto/rails4-bluemix-buildpack,beydogan/ruby-buildpack,brightbytes/heroku-buildpack-ruby-without-assets-precompile,brightbytes/heroku-buildpack-ruby-without-assets-precompile,jumptvs/BP_Ruby,cloudfoundry/ruby-buildpack,jgable/buildpack-ruby-rack-setup-tasks,beydogan/ruby-buildpack,heroku/heroku-buildpack-ruby,moneyadviceservice/heroku-buildpack-ruby-bowndler,instacart/heroku-buildpack-ruby,ericboehs/heroku-buildpack-ruby,cordata/heroku-buildpack-ruby,zunda/heroku-buildpack-ruby,pkgr/heroku-buildpack-ruby,mattmanning/heroku-buildpack-ruby-jekyll,Scalingo/ruby-buildpack,zoomer/heroku-buildpack-ruby-bower,moneyadviceservice/heroku-buildpack-ruby-bowndler,cloudfoundry/ruby-buildpack,qnyp/heroku-buildpack-ruby-bower,jgable/buildpack-ruby-rack-setup-tasks,Genius/heroku-buildpack-ruby,vhx/heroku-buildpack,orenyk/heroku-buildpack-ruby,instacart/heroku-buildpack-ruby,jonseaberg/heroku-buildpack-turbo-sprockets,qnyp/heroku-buildpack-ruby-bower,jonseaberg/heroku-buildpack-turbo-sprockets,ruby/heroku-buildpack-www-ruby-lang,pkgr/heroku-buildpack-ruby