[gvfs] Update NEWS for 1.17.3 release

[Ondrej Holy <oholy src gnome org>]

commit a02a2066e047321dd3a9080b9217743485b768b8
Author: Ondrej Holy <oholy redhat com>
Date:   Mon Jul 8 18:35:51 2013 +0200

    Update NEWS for 1.17.3 release

 NEWS |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/NEWS b/NEWS
index bcdea85..1da3bcf 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,9 @@
+Major changes in 1.17.3
+=======================
+* Clean shutdown implementation for various backends
+* tests: Various fixes
+* afc: Update to libimobiledevice new api
+
 Major changes in 1.17.2
 =======================
 * metadata: Fix write regression