[gnome-software] Created tag 3.30.4

[Kalev Lember <klember src gnome org>]

The signed tag '3.30.4' was created.

Tagger: Kalev Lember <klember redhat com>
Date: 1540384460 +0200

    ==== Version 3.30.4 ====

Changes since the last tag '3.30.3':

Kalev Lember (18):
      trivial: Post release version bump
      packagekit refresh: Don't implement gs_plugin_update
      update monitor: trivial: Rename a variable
      update monitor: Notify about offline updates after they are downloaded
      updates page: trivial: Rename a variable
      updates section: Split up offline update downloading and installing
      systemd updates: Fix various issues with refine
      app row: Don't show size for offline updatable apps
      Use background tasks for update monitor initiated packagekit downloads
      shell: Tweak which errors messages are shown for the DOWNLOAD action
      plugin loader: Reset related apps progress when a job finishes
      css: Style progress button so that it starts with 0% of progress filled
      packagekit refresh: Avoid re-downloading metadata for gs_plugin_download()
      Use new appstream-glib API for correctly comparing package versions
      updates page: Remove a misleading string
      updates page: Fix network availability check for mobile refresh
      updates page: Don't hide the refresh button in failure state
      Release version 3.30.4

Matej Urbančič (1):
      Updated Slovenian translation