Version 3.21.1
~~~~~~~~~~~~~~
Released: 2016-04-25

This is an unstable release in the 3.19 development series, with the following
improvements:
 * Add an initial loading panel when there is no metadata
 * Add an outline ostree plugin that just adds remotes as sources
 * Add an unreviewable application quirk
 * Add initial Steam support
 * Add support for app shortcut addition/removal
 * Add support for GNOME Shell extensions
 * Allow free-but-unspecified SPDX tokens
 * Allow widgets to use custom CSS in a generic way
 * Do the PackageKit refresh as a background transaction
 * Hide "Software Sources" menu when its action is disabled
 * Make the distro upgrades dialog match the new mockup
 * Split the 'size' property into size-installed and size-download
 * Use a link instead of a button for history
 * Use AppStream files for the popular, featured and extra category data
 * Use dpkg-deb info to create a GsApp when double clicking on a .deb file
 * Use FwupdClient from fwupd 0.7.0
 * Use GdkPixbuf to parse icns files
 * Use gsettings to enable/disable the 'sources' action
 * Use the Fedora themed image for the upgrade banner
 * When there are no trusted sources mark everything as non-3rd-party

The following bugs are also fixed:
 * Actually show the error dialog for an invalid file
 * Allow all functions called by g_module_symbol() to fail
 * Allow popular and featured apps to match any prefix
 * Do not maintain a cache of applications in the plugin loader