Added note on build version info improvement

CHANGELOG.md

@@ -44,6 +44,10 @@ Code Quality
 
 - Reformatted Javascript per Mattermost Style Guide
  
+UI
+
+- Added version, build number, build date and build hash under Account Settings -> Security (to be moved to "About" dialog later)
+
 ### Bug Fixes
 
 - Fixed performance issue with slow typing on iOS