added lubuntu-update-notifier

Summary: added lubuntu-update-notifier

Test Plan: see if lubuntu-update-notifier is in new iso

Reviewers: wxl, tsimonq2

Reviewed By: wxl

Differential Revision: https://phab.lubuntu.me/D55

desktop

@@ -120,6 +120,7 @@ Task-Metapackage: lubuntu-desktop
 
  * software-properties-qt           # Nice GUI to change reporsitory settings / extra drivers
  * ubuntu-release-upgrader-qt
+ * lubuntu-update-notifier
 
  * fcitx-frontend-qt5               # Note: do NOT add fcitx-ui-qimpanel