WEB_CONCURRENCY isn't required in app.json
WEB_CONCURRENCY isn't required in app.json

Heroku Review Apps can work well without this configuration set.

[closes #773]

headwayio/voyage,welaika/welaika-suspenders,thoughtbot/suspenders,Mossio/hashira-rails,delphaber/suspenders,headwayio/suspenders,headwayio/suspenders,welaika/welaika-suspenders,toobulkeh/suspenders,delphaber/suspenders,Mossio/hashira-rails,welaika/welaika-suspenders,headwayio/suspenders,mukkoo/welaika-suspenders,Mossio/hashira-rails,toobulkeh/suspenders,delphaber/suspenders,headwayio/suspenders,Mossio/hashira-rails,mukkoo/welaika-suspenders,headwayio/voyage,headwayio/voyage,thoughtbot/suspenders,toobulkeh/suspenders,thoughtbot/suspenders,headwayio/voyage,mukkoo/welaika-suspenders