[AppStream] AppStream Generator 0.6.7 released!

[Matthias Klumpp]

Version 0.6.7
~~~~~~~~~~~~~~
Released: 2017-10-02

Features:
 * ci: Enable gdc again for testing (Matthias Klumpp)
 * Make rpmmd backend work (Matthias Klumpp)
 * Make an empty main function for embedded unittests (Matthias Klumpp)
 * Add a metainfo file (Matthias Klumpp)
 * Add a manual page (Matthias Klumpp)
 * Sort suite names on the index page (Matthias Klumpp)

Bugfixes:
 * use file.exists to check file existence (Antonio Rojas)
 * arch: Don't ref generator results (Matthias Klumpp)
 * Improve the icon tarball generation code (Matthias Klumpp)
 * Resolve deprecation warning (Matthias Klumpp)