Add Heroku Review App support
Add Heroku Review App support

ScottDowne/petitions.mozilla.org,alicoding/petition-template,alicoding/petitions.mozilla.org,ScottDowne/petitions.mozilla.org,mozilla/petitions.mozilla.org,alicoding/petition-template,alicoding/petitions.mozilla.org,ScottDowne/petition-template,ScottDowne/petition-template,mozilla/petitions.mozilla.org