[gvfs] Update NEWS for 1.27.91 release

[Ondrej Holy <oholy src gnome org>]

commit dc32927e77f9a6231e239aad0c6d76698019a209
Author: Ondrej Holy <oholy redhat com>
Date:   Mon Feb 29 19:49:35 2016 +0100

    Update NEWS for 1.27.91 release

 NEWS |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/NEWS b/NEWS
index fd6bd22..9a5132a 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,8 @@
+Major changes in 1.27.91
+========================
+* udisks2: Send unmount notification only once when stopping
+* Translation updates
+
 Major changes in 1.27.90
 ========================
 * udisks2: Avoid crashes during unmount