[mutter] Created tag 3.31.91

[Florian Müllner <fmuellner src gnome org>]

The signed tag '3.31.91' was created.

Tagger: Florian Müllner <fmuellner gnome org>
Date: 1550779702 +0100

    Tag release 3.31.91

Changes since the last tag '3.31.90':

Adam Jackson (4):
      clutter: Remove deprecated/clutter-util.h
      clutter: Remove deprecated/clutter-backend.h
      clutter: Remove deprecated/clutter-timeout-pool.h
      clutter: Remove deprecate/clutter-frame-source.h

Alan Mortensen (1):
      Updated Danish translation

Anders Jonsson (1):
      Update Swedish translation

Andrea Azzarone (2):
      keybindings: Add flag param to grab_accelerator
      keybinding: Store flags in MetaKeyGrab

Aurimas Černius (1):
      Updated Lithuanian translation

Baurzhan Muftakhidinov (1):
      Update Kazakh translation

Carlos Garnacho (1):
      wayland: Reset text-input state after commit

Charles Monzat (1):
      Update French translation

Claude Paroz (1):
      Updated French translation

Daniel Mustieles (1):
      Updated Spanish translation

Daniel Șerbănescu (1):
      Update Romanian translation

Emilio Pozuelo Monfort (2):
      monitor-config-manager: reuse old CRTC when possible
      monitor-config-manager: respect other outputs' CRTC

Emin Tufan Çetin (1):
      Update Turkish translation

Florian Müllner (1):
      Bump version to 3.31.91

Fran Dieguez (1):
      Update Galician translation

Jiri Grönroos (1):
      Update Finnish translation

Jonas Ådahl (2):
      README: Add contribution section
      gitlab-ci.yml: Add check for issue or MR URL

Marco Trevisan (Treviño) (9):
      input-mapper: Don't loop infinitely in EDID matching
      input-mapper: Use g_auto to free a string array
      gitlab-ci: Don't upload test artifacts
      window: Add is_focusable class method
      window-x11: Move take_focus to MetaWindowX11Private
      window-x11: Move delete_window to MetaWindowX11Private
      window: Move can_ping to a function and implement in X11
      window: Return focusable ability looking at properties only
      window-actor: Remove public declaration for get_x_window

Marek Cernocky (1):
      Updated Czech translation

Matej Urbančič (1):
      Updated Slovenian translation

Niels De Graef (3):
      meta-launcher: g_propagate_*_error takes ownership
      gpu: Remove unimplemented ::get_kms_file_path()
      cogl: Remove CoglBool, use gboolean instead

Olivier Fourdan (3):
      wayland/xdg-shell: Do not maximize if not possible
      window: Do not restore shortcuts on a NULL window
      MetaPluginManager: Don't return void value

Pekka Paalanen (1):
      monitor-unit-tests: initial crtcs in custom_lid_switch

Rafael Fontenelle (1):
      Update Brazilian Portuguese translation

Yi-Jyun Pan (1):
      Update Chinese (Taiwan) translation