[gbrainy] Update NEWS

[Jordi Mas <jmas src gnome org>]

commit 82bd3280a13f8ddaeab091a6958d368bc01578fd
Author: Jordi Mas <jmas softcatala org>
Date:   Tue Oct 4 08:13:53 2016 +0200

    Update NEWS

 NEWS |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/NEWS b/NEWS
index a6f21c6..54b51b4 100644
--- a/NEWS
+++ b/NEWS
@@ -1,5 +1,11 @@
 gbrainy NEWS
 
+Version 2.3.1
+* Port to new documentation infrastructure
+* Updated translations
+* Better metadata describing the app for software centers
+* Small bug fixes
+
 Version 2.3.0
 * Ported to GTK 3.0
 * Updated translations