[gnome-shell] Bump version to 3.31.4

[Florian Müllner <fmuellner src gnome org>]

commit e5a0dcb47e1131db2811e8d39b21c89efa70d862
Author: Florian Müllner <fmuellner gnome org>
Date:   Thu Jan 10 20:37:30 2019 +0100

    Bump version to 3.31.4
    
    Update NEWS.

 NEWS        | 21 +++++++++++++++++++++
 meson.build |  4 ++--
 2 files changed, 23 insertions(+), 2 deletions(-)
---
diff --git a/NEWS b/NEWS
index 91d34d679..7b66c4117 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,24 @@
+3.31.4
+======
+* Improve icon grid performance [Daniel; #174]
+* Remove browser plugin [Michael; #766776]
+* Add DBus API for introspecting the application state [Jonas, Olivier; !326]
+* Always allow leaving the overview via the hot-corner [Pascal; #429]
+* Misc. bug fixes [Florian, Jasper, Andrea, Sam, Dani, Cosimo, Jonas, Carlos;
+  #643595, #673767, !293, #783, #781, !298, !297, #782, !301, !314, !305, #799,
+  #632, !327]
+
+Contributors:
+  Jonas Ådahl, Andrea Azzarone, Michael Catanzaro, Cosimo Cecchi, daniruiz,
+  Olivier Fourdan, Carlos Garnacho, Sam Hewitt, Andre Klapper, Florian Müllner,
+  Pascal Nowack, Jasper St. Pierre, RyuzakiKK, Marco Trevisan (Treviño),
+  João Paulo Rechi Vita, Daniel van Vugt
+
+Translators:
+  Kristjan SCHMIDT [eo], Matej Urbančič [sl], Daniel Mustieles [es],
+  Fabio Tomat [fur], Emin Tufan Çetin [tr], Anders Jonsson [sv],
+  Ryuta Fujii [ja]
+
 3.31.2
 ======
 * Port away from and remove ShellGenericContainer [Georges; !153]
diff --git a/meson.build b/meson.build
index ff4aa90da..8b68e06f6 100644
--- a/meson.build
+++ b/meson.build
@@ -1,5 +1,5 @@
 project('gnome-shell', 'c',
-  version: '3.31.2',
+  version: '3.31.4',
   meson_version: '>= 0.47.0',
   license: 'GPLv2+'
 )
@@ -23,7 +23,7 @@ gi_req = '>= 1.49.1'
 gjs_req = '>= 1.47.0'
 gtk_req = '>= 3.15.0'
 json_glib_req = '>= 0.13.2'
-mutter_req = '>= 3.31.2'
+mutter_req = '>= 3.31.4'
 polkit_req = '>= 0.100'
 schemas_req = '>= 3.27.90'
 startup_req = '>= 0.11'