try to fix heroku deployment, copying TEF-108#12

mrotondo wants to merge 1 commit intomaincodeforamerica/cfa-ui-components:mainfrom

TEF-132-set-up-heroku-review-apps-for-cf-a-ui-components-lookbook-appcodeforamerica/cfa-ui-components:TEF-132-set-up-heroku-review-apps-for-cf-a-ui-components-lookbook-appCopy head branch name to clipboard