Update CHANGELOG

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 BACKWARDS INCOMPATIBILITIES:
 
+* "virtualbox" builder has been renamed to "virtualbox-iso". Running your
+   template through `packer fix` will resolve this.
 * post-processor/vagrant: Syntax for overriding by provider has changed.
   See the documentation for more information. Running your template
   through `packer fix` should resolve this.
@@ -18,6 +20,8 @@ FEATURES:
 * **New builder:** Google Compute Engine. You can now build images for
   use in Google Compute Engine. See the documentation for more information.
   [GH-715]
+* **New builder:** "virtualbox-ovf" can build VirtualBox images from
+  an existing OVF or OVA. [GH-201]
 * "description" field in templates: write a human-readable description
   of what a template does. This will be shown in `packer inspect`.
 * Vagrant post-processor now accepts a list of files to include in the