[gnome-session] NEWS: Update for release

[Ray Strode <halfline src gnome org>]

commit 91f8ea1fa458a87a394b2ee953736e8d987b6bed
Author: Ray Strode <rstrode redhat com>
Date:   Fri Jul 22 13:31:11 2016 -0400

    NEWS: Update for release

 NEWS |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)
---
diff --git a/NEWS b/NEWS
index d947802..6b07d4d 100644
--- a/NEWS
+++ b/NEWS
@@ -1,4 +1,13 @@
 ==============
+Version 3.21.4
+==============
+       * Export renderer string for llvmpipe
+       * Small heap overflow fix
+       * Compiler warning fixes
+       * misc doc fixes
+       * Futureproof gettext support
+
+==============
 Version 3.21.3
 ==============
        * Translation updates