Bump heroku3 from 4.2.3 to 5.1.5#510

dependabot[bot] wants to merge 1 commit intoMasterhttps-jrtorres042-github-com/foundation.mozilla.org:Masterfrom

dependabot/pip/heroku3-5.1.5https-jrtorres042-github-com/foundation.mozilla.org:dependabot/pip/heroku3-5.1.5Copy head branch name to clipboard