chore(changes): update changes-2.4.0.md

changes/changes-2.4.0.md

@@ -9,6 +9,8 @@ Apollo 2.4.0
 * [Feature support portal restTemplate Client connection pool config](https://github.com/apolloconfig/apollo/pull/5200)
 * [Feature added the ability for administrators to globally search for Value](https://github.com/apolloconfig/apollo/pull/5182)
 * [Feature support the observe status access-key for pre-check and logging only](https://github.com/apolloconfig/apollo/pull/5236)
+* [Feature support to assign users management authority by the cluster (modify, publish)](https://github.com/apolloconfig/apollo/pull/5302)
+* [Feature support to notification by email when releasing by OpenApi also](https://github.com/apolloconfig/apollo/pull/5324)
 
 ------------------
 All issues and pull requests are [here](https://github.com/apolloconfig/apollo/milestone/15?closed=1)