Heroku Toolbelt `addons` command output changing
Change effective on 25 September 2015
In a few days, we’ll be shipping a change that brings considerable improvements to the information output of the heroku addons command.
This change will probably break scripts that rely on the heroku addons command. We recommend installing the new commands early with heroku plugins:install heroku-cli-addons and testing the new output. The new --json flag will give you a convenient output for quick scripts, or you should switch to using our Platform API in long-lived scripts as a consistency measure.