CHANGELOG.md entry about data dir backup based on version file

CHANGELOG.md

@@ -56,6 +56,9 @@ Changelog](https://keepachangelog.com/en/1.0.0/).
 - ATT&CK report bug that said that the technique "`.bash_profile` and `.bashrc`" was not attempted
   when it actually was attempted but failed. #1511
 - Bug that periodically cleared the telemetry table's filter. #1392
+- Updating the Infection Monkey will backup the old data
+and will create a new data directory to prevent incompatibilities and crashes. #1114
+
 
 ### Security
 - Generate a random password when creating a new user for CommunicateAsNewUser