[gdm] NEWS: update for release

[Ray Strode <halfline src gnome org>]

commit 1a292d913d24eb9af6d88dd972bf6169b8391b08
Author: Ray Strode <rstrode redhat com>
Date:   Wed Aug 31 15:56:55 2016 -0400

    NEWS: update for release

 NEWS |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/NEWS b/NEWS
index a915204..406fe90 100644
--- a/NEWS
+++ b/NEWS
@@ -1,4 +1,10 @@
 ===============
+Version 3.21.91
+===============
+- fix autologin on non-LUKS systems
+- import environment from systemd user manager
+
+===============
 Version 3.21.90
 ===============
 - Use LUKS password for to unlock gnome-keyring at login (when autologin is enabled)