update CHANGELOG

CHANGELOG.md

@@ -22,6 +22,10 @@ FEATURES:
       connections. Note that provisioners won't work if this is done. [GH-1591]
   * **SSH Agent Forwarding:** SSH Agent Forwarding will now be enabled
       to allow access to remote servers such as private git repos. [GH-1066]
+  * **New config function: `build_name`**: The name of the currently running
+      build. [GH-2232]
+  * **New config function: `build_type`**: The type of the currently running
+      builder. This is useful for provisioners. [GH-2232]
   * **New config function: `template_dir`**: The directory to the template
       being built. This should be used for template-relative paths. [GH-54]