Update CHANGELOG.md

Author: dunglas

CHANGELOG.md

@@ -1,5 +1,10 @@
 # Changelog
 
+## 2.4.5
+
+* Fix denormalization of a constructor argument which is a collection of non-resources
+* Allow custom operations to return a different class than the expected resource class
+
 ## 2.4.4
 
 * Store the original data in the `previous_data` request attribute, and allow to access it in security expressions using the `previous_object` variable (useful for PUT and PATCH requests)