Update CHANGELOG.md

Author: jeclarke

CHANGELOG.md

@@ -6,6 +6,7 @@ All notable changes to this project will be documented in this file.
 - PNDA-4405: Require user and package fields in create application API
 - PNDA-4389: Reject packages containing upstart.conf files
 - PNDA-4525: Deprecate Ubuntu 14.04
+- PNDA-4511: Use a config property to set which spark-submit command to call for spark streaming components
 
 ### Fixed
 - PNDA-4218: Fix application deletion when app name is an HDFS username