[gnome-tweaks] Created tag 3.31.1

[Jeremy Bicha <jbicha src gnome org>]

The signed tag '3.31.1' was created.

Tagger: Jeremy Bicha <jbicha ubuntu com>
Date: 1538960763 -0400

    3.31.1

Changes since the last tag '3.30.1':

Jeremy Bicha (5):
      build: don't use subdirectories for icons
      build: sort data/meson.build
      build: Bump version number for 3.31 series
      README: sound-theme-freedesktop is required
      3.31.1

Marionauta (1):
      Updated Spanish translation

Sam Hewitt (2):
      icon: update app icon
      icon: update logo.png

prakashdanish (5):
      cleanup: Remove unused imports
      cleanup: sort imports
      cleanup: Adjust spacing for pycodestyle compliance
      cleanup: Use "is None" instead of "== None"
      cleanup: Reorder to use "not in"

Марко Костић (1):
      Update Serbian translation