[gnome-shell] Bump version to 3.31.91

[Florian Müllner <fmuellner src gnome org>]

commit a4e4da705a3645b2a26d6dfeb2e6c4a730ea3abf
Author: Florian Müllner <fmuellner gnome org>
Date:   Thu Feb 21 19:58:25 2019 +0100

    Bump version to 3.31.91
    
    Update NEWS.

 NEWS        | 19 +++++++++++++++++++
 meson.build |  4 ++--
 2 files changed, 21 insertions(+), 2 deletions(-)
---
diff --git a/NEWS b/NEWS
index 9d1eaf588..49c80407e 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,22 @@
+3.31.91
+=======
+* Don't close on-screen-keyboard's language menu on hover [Florian; #171]
+* Don't let unfullscreen gesture interfere with top bar taps [Jonas D.; #552]
+* Always use symbolic user icon in system menu [Florian; #957]
+* Add flags parameter in GrabAccelerators API [Andrea; #68]
+* Misc. bug fixes and cleanups [Florian, Jonas A.; !399, !398, !400, !402,
+  !407, !410, !411]
+
+Contributors:
+  Jonas Ådahl, Andrea Azzarone, Arnaud Bonatti, Jonas Dreßler, Florian Müllner
+
+Translators:
+  Jordi Mas [ca], Ryuta Fujii [ja], Marek Cernocky [cs], Fran Dieguez [gl],
+  Jiri Grönroos [fi], Serdar Sağlam [tr], Anders Jonsson [sv],
+  Matej Urbančič [sl], Gun Chleoc [gd], Kukuh Syafaat [id],
+  Baurzhan Muftakhidinov [kk], Alan Mortensen [da], Rafael Fontenelle [pt_BR],
+  Sveinn í Felli [is]
+
 3.31.90
 =======
 * Fix input methods after ibus restarts [Takao; #295]
diff --git a/meson.build b/meson.build
index e1b99d31e..0c31b47cd 100644
--- a/meson.build
+++ b/meson.build
@@ -1,5 +1,5 @@
 project('gnome-shell', 'c',
-  version: '3.31.90',
+  version: '3.31.91',
   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 = '>= 3.31.90'
+mutter_req = '>= 3.31.91'
 polkit_req = '>= 0.100'
 schemas_req = '>= 3.27.90'
 startup_req = '>= 0.11'