[gnome-software] Created tag 3.26.4

[Kalev Lember <klember src gnome org>]

The signed tag '3.26.4' was created.

Tagger: Kalev Lember <klember redhat com>
Date: Sun Dec 17 09:58:04 2017 +0100

    ==== Version 3.26.4 ====

Changes since the last tag 'GNOME_SOFTWARE_3_26_3':

Kalev Lember (6):
      trivial: Post release version bump
      Add locking to the repos plugin
      sources dialog: Don't crash when closing the dialog while it's loading
      Fix GsAppRow lifetime issues when connecting to GsApp signals
      plugin loader: Don't log debug messages on INFO level
      Release version 3.26.4

Petr Kovar (1):
      Update Czech translation

Piotr Drąg (1):
      Update Polish translation

Richard Hughes (8):
      Show the empty stack contents when there are no sources to show
      Don't require the user to keep clicking 'More reviews' after each click
      trivial: Show icons in the updated dialog
      Ignore the 'and later' part of the SPDX ID when working out if it is 'free'
      Copy files installed from /tmp
      shell-extensions: Return an error from _setup() when GNOME Shell is not running
      packagekit: Do not crash when getting an invalid ID from PackageKit
      fwupd: Prepend the vendor name to the device name if not included

Stas Solovey (1):
      Update Russian translation