[gnome-nibbles] Prepare 3.31.3

[Michael Catanzaro <mcatanzaro src gnome org>]

commit e5e798d39c7727b02be36d92f2189e4d7a59fe3e
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Mon Dec 10 22:39:07 2018 -0600

    Prepare 3.31.3

 NEWS         | 7 +++++++
 configure.ac | 2 +-
 2 files changed, 8 insertions(+), 1 deletion(-)
---
diff --git a/NEWS b/NEWS
index 078199d..b32792d 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,10 @@
+3.31.3 - December 10, 2018
+==========================
+
+- Fix display of level completed label and next level button (#22, Pedro Aldatxarren)
+- Replace app menu with window menu (Jeremy Bicha)
+- Updated translations
+
 3.23.92 - March 13, 2017
 ========================
 
diff --git a/configure.ac b/configure.ac
index 11f7543..b466c39 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,5 +1,5 @@
 AC_PREREQ([2.63])
-AC_INIT([GNOME Nibbles], [3.23.92], [https://bugzilla.gnome.org/],
+AC_INIT([GNOME Nibbles], [3.31.3], [https://bugzilla.gnome.org/],
         [gnome-nibbles], [https://gnome.org.wiki/Apps/Nibbles])
 AM_INIT_AUTOMAKE([1.11 no-dist-gzip dist-xz foreign])
 AM_SILENT_RULES([yes])