Update CHANGELOG.md

Author: trsmith2

CHANGELOG.md

@@ -15,6 +15,7 @@ All notable changes to this project will be documented in this file.
 - PNDA-4546: Accept username as a URL parameter instead of in the request body and apply basic authorisation so only the user who created an application (or a special admin user defined in the dm-config file) can modify it
 - PNDA-4613: Rename user parameter for deployment manager API from user to user.name to match the default knox behaviour
 - PNDA-4560: Remove admin_user setting from unit tests
+- PNDA-4500: Redesigned application detailed summary and added flink application detailed summary
 
 ### Fixed
 - PNDA-4218: Fix application deletion when app name is an HDFS username