Update build output in README
Update build output in README

lyoshenka/heroku-buildpack-ruby-jekyll,mattmanning/heroku-buildpack-ruby-jekyll,mattmanning/heroku-buildpack-ruby-jekyll,hausdorff/heroku-buildpack-ruby-jekyll,hausdorff/heroku-buildpack-ruby-jekyll,lyoshenka/heroku-buildpack-ruby-jekyll,darron/heroku-buildpack-ruby-jekyll,darron/heroku-buildpack-ruby-jekyll