[mutter] Bump version to 3.31.91

[Florian Müllner <fmuellner src gnome org>]

commit fca0e6abb14b255d6211af7e4621b7c5903880a9
Author: Florian Müllner <fmuellner gnome org>
Date:   Thu Feb 21 19:45:43 2019 +0100

    Bump version to 3.31.91
    
    Update NEWS.

 NEWS        | 23 +++++++++++++++++++++++
 meson.build |  2 +-
 2 files changed, 24 insertions(+), 1 deletion(-)
---
diff --git a/NEWS b/NEWS
index cdfcae05d..b0acfd860 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,26 @@
+3.31.91
+=======
+* Fix infinite loop in EDID matching [Marco; #459]
+* wayland: Don't resetin text-input state prematurely [Carlos; !410]
+* wayland: Don't maximize windows if minimum size is too big [Olivier; #463]
+* Fix crash when using "restore shortcuts" without focus window [Olivier; #464]
+* Add flag parameter to grab accelerator API [Andrea; !169]
+* Reuse old CRTC if possible to avoid flicker on hotplug [Pekka, Emilio; #373]
+* Misc. bug fixes and cleanups [Marco, Jonas, Niels, Adam, Olivier; !436,
+  !421, #462, !439, !440, !444, !321, !445, !456]
+
+Contributors:
+  Jonas Ådahl, Andrea Azzarone, Olivier Fourdan, Carlos Garnacho,
+  Niels De Graef, Adam Jackson, Emilio Pozuelo Monfort, Pekka Paalanen,
+  Marco Trevisan (Treviño)
+
+Translators:
+  Jiri Grönroos [fi], Charles Monzat [fr], Claude Paroz [fr], Fran Dieguez [gl],
+  Emin Tufan Çetin [tr], Aurimas Černius [lt], Anders Jonsson [sv],
+  Matej Urbančič [sl], Marek Cernocky [cs], Daniel Șerbănescu [ro],
+  Alan Mortensen [da], Baurzhan Muftakhidinov [kk], Yi-Jyun Pan [zh_TW],
+  Daniel Mustieles [es], Rafael Fontenelle [pt_BR]
+
 3.31.90
 =======
 * Fix support of extended characters in on-screen keyboard [Andrea; #109]
diff --git a/meson.build b/meson.build
index c3039466d..7de4eba55 100644
--- a/meson.build
+++ b/meson.build
@@ -1,5 +1,5 @@
 project('mutter', 'c',
-  version: '3.31.90',
+  version: '3.31.91',
   meson_version: '>= 0.48.0',
   license: 'GPLv2+'
 )