[gnome-shell-extensions] 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: 1550785852 +0100

    Tag release 3.31.91

Changes since the last tag '3.31.90':

Florian Müllner (7):
      Update sass submodule
      ci: Check for issue/MR URLs in commit messages
      apps-menu: Remove outdated legacy-tray handling
      cleanup: Use destructuring for imports from GI
      places-menu: Stop using deprecated Mainloop module
      Update sass submodule
      Bump version to 3.31.91

Gun Chleoc (1):
      Update Scottish Gaelic translation

Matej Urbančič (1):
      Added Slovenian translation

Tomasz Gąsior (1):
      User theme: compatibility with XDG Base Directory