Update README
Update README

puppet-heat is now part of StackForge repo and ready for Havana.

Change-Id: I4289df8429d0d1a9d3dbee38098d66a6e0a25ab3
Signed-off-by: Emilien Macchi <d605a501dec15c980af71d9dfebf4b595ab6da1f@enovance.com>

syseleven/puppet-heat