Update CHANGELOG.md

CHANGELOG.md

@@ -3,6 +3,7 @@
 BACKWARDS INCOMPATIBILITIES / NOTES:
 
  * Terraform's built-in plugins are now distributed as part of the main Terraform binary, and use the go-plugin framework. Overrides are still available using separate binaries, but will need recompiling against Terraform 0.7.
+ * The `terraform plan` command no longer persists state. This makes the command much safer to run, since it is now side-effect free. The `refresh` and `apply` commands still persist state to local and remote storage. Any automation that assumes that `terraform plan` persists state will need to be reworked to explicitly call `terraform refresh` to get the equivalent side-effect.
  * The `concat()` interpolation function can no longer be used to join strings.
  * `openstack_networking_subnet_v2` now defaults to turning DHCP on.
 
@@ -14,6 +15,7 @@ FEATURES:
  * **New Resource:** `openstack_blockstorage_volume_v2` [GH-6693]
  * core: Data Resources are now supported. Values are refreshed, and available during the planning stage [GH-6598]
  * core: Lists and maps can now be used as first class types for variables, and may be passed between modules [GH-6322]
+ * core: The `terraform plan` command no longer persists state. [GH-6811]
 
 IMPROVEMENTS: