[gparted] Add xdg-su to README (#699626)

[Curtis Gedak <gedakc src gnome org>]

commit 00960e0172ae44a907a93ca77f7ef14b1e593772
Author: Curtis Gedak <gedakc gmail com>
Date:   Sun May 5 12:39:27 2013 -0600

    Add xdg-su to README (#699626)
    
    Add xdg-su to list of possible programs used to acquire root
    privileges in the gparted.desktop file.
    
    Bug #699626 - Enable gparted.desktop to prompt for root on default
                  openSUSE installation

 README |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/README b/README
index c5edfbb..e5c5b41 100644
--- a/README
+++ b/README
@@ -194,6 +194,9 @@ These commands include:
    kdesudo       - alternatively used to acquire root privileges in .desktop
                    file if gksudo and gksu not available, but only if available
                    when gparted source is configured.
+   xdg-su        - alternatively used to acquire root privileges in .desktop
+                   file if gksudo, gksu, and kdesudo are not available, but only
+                   if available when gparted source is configured.
    udevinfo      - used in dmraid to query udev name
    udevadm       - used in dmraid to query udev name
    yelp          - used to display help manual