Proxy CircleCI webhooks to Slack
heroku create -b https://github.com/kr/heroku-buildpack-go.git
heroku config:add SLACK_BOTNAME=circleci SLACK_CHANNEL=#code SLACK_ORGANIZATION=org SLACK_TOKEN=xxx
circle.yml:
notify:
webhooks:
- url: https://circle2slack-app.herokuapp.com/build/