Would you say this is still relevant? When I try to follow these instructions, I get
2019-08-02T00:10:02.836781+00:00 heroku[router]: at=error code=H10 desc=“App crashed” method=GET path="/" host=xxxx.herokuapp.com request_id=95f93426-3129-48a7-800f-98c0789ae696 fwd=“173.59.63.17” dyno= connect= service= status=503 bytes= protocol=http
2019-08-02T00:10:03.644658+00:00 heroku[router]: at=error code=H10 desc=“App crashed” method=GET path="/favicon.ico" host=xxxxherokuapp.com request_id=15855a04-5493-4aba-beaf-34cf70b79eaa fwd=“173.59.63.17” dyno= connect= service= status=503 bytes= protocol=http