[gdm] NEWS: update for release

[Ray Strode <halfline src gnome org>]

commit fde3ac11bdc79070061dbf26509a75952cd9b093
Author: Ray Strode <rstrode redhat com>
Date:   Fri Dec 19 09:07:07 2014 -0500

    NEWS: update for release

 NEWS |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)
---
diff --git a/NEWS b/NEWS
index 85391ff..38a0d01 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,10 @@
+================
+Version 3.15.3.1
+================
+- Actually set XDG_SESSION_TYPE in user sessions
+- Don't require plymouth if using systemd
+- require --without-plymouth to disable plymouth support
+
 ===============
 Version 3.15.3
 ===============