CircleCI will handle releases. Pushing to master automatically will release to the beta channel if the tests are successful. Tagging with a version number will release to stable.
Release to dev channel by pushing to the dev
branch. Add other dev channels by adding a channel to circle.yml
Instructions:
brew bump-formula-pr --url=https://cli-assets.heroku.com/heroku-cli/channels/stable/heroku-cli-v6.6.17-f15d070-darwin-x64.tar.xz heroku --version=6.6.17