updated change log.

laravel/documentation/changes.md

@@ -28,6 +28,7 @@
 - Fixed replacement of optional parameters in URL::transpose method.
 - Improved View performance by only loading contents from file once.
 - Fix handling of URLs beginning with has in URL::to.
+- Fix the resolution of unset Eloquent attributes.
 
 <a name="upgrade-3.2"></a>
 ## Upgrading From 3.1