Change effective on 12 August 2015
Starting today, new Heroku Toolbelt installs will not come with Foreman. The command
heroku local has replaced
foreman. Heroku Local makes use of Forego to accomplish its tasks and it’s faster and has better cross-platform support. Foreman can still be installed manually if you want to use it.
For more information, see the Heroku Local Dev Center article.