[gvfs] Update NEWS for 1.21.91 release

[Ondrej Holy <oholy src gnome org>]

commit 7f26437b838caf5e955a97a3ce39d4a73266c775
Author: Ondrej Holy <oholy redhat com>
Date:   Fri Aug 29 12:16:20 2014 +0200

    Update NEWS for 1.21.91 release

 NEWS |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)
---
diff --git a/NEWS b/NEWS
index 6553969..eea439e 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,11 @@
+Major changes in 1.21.91
+========================
+* ftp: Fix crashing with latest glib
+* tests: Gnome desktop testing integration
+* dav: Force unmount when dns-sd data changes
+* Several smaller bugfixes
+* Translation updates
+
 Major changes in 1.21.90
 ========================
 * gvfs-save: Allow specifying G_FILE_CREATE_REPLACE_DESTINATION