added log off to polybar.template

src/defaults/polybar.template

@@ -131,6 +131,8 @@ menu-0-0 = reboot
 menu-0-0-exec = menu-open-1
 menu-0-1 = power off
 menu-0-1-exec = menu-open-2
+menu-0-2 = log off
+menu-0-2-exec = menu-open-3
 
 menu-1-0 = cancel
 menu-1-0-exec = menu-open-0
@@ -142,6 +144,11 @@ menu-2-0-exec = poweroff
 menu-2-1 = cancel
 menu-2-1-exec = menu-open-0
 
+menu-3-0 = log off
+menu-3-0-exec = pkill -KILL -u $USER
+menu-3-1 = cancel
+menu-3-1-exec = menu-open-0
+
 [settings]
 screenchange-reload = true