Heroku Button now works with private GitHub repos

Change effective on 13 April 2015

Heroku Button is no longer limited to source code hosted in public GitHub repos. It now works with both public and private GitHub repos. When used with private repos, a template URL parameter must be specified in the button URL and the Heroku user must be linked to a GitHub account that has access to the private repo.

See the Dev Center Heroku Button documentation for details.