Update CHANGELOG.md
Update CHANGELOG.md

add info on updatenotification module improvements
Tyvonne/MagicMirror,n8many/MagicMirror,n8many/MagicMirror,roramirez/MagicMirror,MichMich/MagicMirror,n8many/MagicMirror,roramirez/MagicMirror,MichMich/MagicMirror,MichMich/MagicMirror,n8many/MagicMirror,Tyvonne/MagicMirror,n8many/MagicMirror,Tyvonne/MagicMirror,MichMich/MagicMirror,roramirez/MagicMirror,Tyvonne/MagicMirror,roramirez/MagicMirror