Update readme.md, heat is now enabled by default

Change-Id: Ia36879711aa440f4fba657159afeba2105c6aae4
diff --git a/README.md b/README.md
index 37b960e..f0406c6 100644
--- a/README.md
+++ b/README.md
@@ -262,10 +262,10 @@
 
 # Heat
 
-Heat is disabled by default. To enable it you'll need the following settings
-in your `localrc` section:
+Heat is enabled by default (see `stackrc` file). To disable it explicitly
+you'll need the following settings in your `localrc` section:
 
-    enable_service heat h-api h-api-cfn h-api-cw h-eng
+    disable_service heat h-api h-api-cfn h-api-cw h-eng
 
 Heat can also run in standalone mode, and be configured to orchestrate
 on an external OpenStack cloud. To launch only Heat in standalone mode