Remove word official from reference to heroku buildpack
Remove word official from reference to heroku buildpack
tonycoco/heroku-buildpack-ember-cli,GabKlein/heroku-buildpack-ember-cli,tonycoco/heroku-buildpack-ember-cli,GabKlein/heroku-buildpack-ember-cli,tonycoco/heroku-buildpack-ember-cli,GabKlein/heroku-buildpack-ember-cli