Add critically low warning to battery script

.scripts/wm/battery.sh

@@ -25,6 +25,8 @@ if [ "$(echo $BAT_INFO | awk '{ print $6 }')" = "remaining" ]; then
 	else
 		ICON=""
 		COLOR="#DC7A43"
+
+		notify-send -u critical -r 1 "Battery critically low!"
 	fi
 else
 	ICON=""