mention Gnome Keyring support in README and Changelog

Changelog

 Gajim 0.11 (XX October 2006)
 
   * Intoducing View Menu (GNOME HIG)
+  * GNOME Keyring Support (if GNOME keyring available, manage passwords and save them in an encrypted file).
   * Ability to now hide the Transports group
   * Support for notify-python so if notification-daemon is not available, we still can show cool popups
   * Ability to operate on more than one contact in one in time in roster (#1514)

README

@@ -22,6 +22,7 @@ NOTE:
 if you still have problems compiling, you may want to try removing the gtk1 series of the above dependencies
 
 Optionally:
+gnome-python-desktop (for GnomeKeyring support)
 dnsutils (or whatever package provides the nslookup binary) for SRV support; if you don't know what that is, you don't need it
 gtkspell and aspell-LANG where lang is your locale eg. en, fr etc
 GnomePythonExtras 2.10 or above so you can avoid compiling trayicon and gtkspell