[gnome-shell-extensions] Bump version to 3.31.91

[Florian Müllner <fmuellner src gnome org>]

commit d5a1044244865ffb188cd31a72eea92d5abf3f5d
Author: Florian Müllner <fmuellner gnome org>
Date:   Thu Feb 21 22:41:20 2019 +0100

    Bump version to 3.31.91
    
    Update NEWS.

 NEWS        | 12 ++++++++++++
 meson.build |  2 +-
 2 files changed, 13 insertions(+), 1 deletion(-)
---
diff --git a/NEWS b/NEWS
index 829f2b3..4e653e9 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,15 @@
+3.31.91
+=======
+* apps-menu: Remove outdated legacy-tray handling [Florian; !53]
+* user-theme: Allow using XDG user data dir [Tomasz; !55]
+* Misc. bug fixes and cleanups [Florian; !52, !54, !56]
+
+Contributors:
+  Tomasz Gąsior, Florian Müllner
+
+Translators:
+  Matej Urbančič [sl], Gun Chleoc [gd]
+
 3.31.90
 =======
 * Misc. bug fixes and cleanups [Florian; !49, !50, !51]
diff --git a/meson.build b/meson.build
index 0115562..7e5fdd3 100644
--- a/meson.build
+++ b/meson.build
@@ -1,5 +1,5 @@
 project('gnome-shell-extensions',
-  version: '3.31.90',
+  version: '3.31.91',
   meson_version: '>= 0.44.0',
   license: 'GPL2+'
 )