Added note about notifyGnome3 being worthless when called from cron

an.py

@@ -64,6 +64,7 @@ def notifyCombo(ioc, state, time_str):
 # set notification function
 #!notify = notifyConsole
 notify = notifyEmail
+# notifyGnome3 doesn't work when call from cron, which makes it worthless
 #!notify = notifyGnome3
 #!notify = notifyOSX
 #!notify = notifyCombo