[AppStream] AppStream 0.11.6 released!

[Matthias Klumpp]

Another bugfix-only release of AppStream.

Tarballs available here: http://www.freedesktop.org/software/appstream/releases

Version 0.11.6
~~~~~~~~~~~~~~
Released: 2017-10-02

Features:
 * Improve screenshot validation (Matthias Klumpp)
 * Allow to disable introspection (Matthias Klumpp)

Bugfixes:
 * Revert back to the old build option names (Matthias Klumpp)
 * Apply maintainer flags equally to C++ and C (Matthias Klumpp)
 * Explicitly set C/C++ standard versions (Matthias Klumpp)
 * vapi: Include the right header (Matthias Klumpp)
 * xml: Correctly write screenshots tag again (Matthias Klumpp)
 * Do not cache a screenshot that doesn't have images (Matthias Klumpp)
 * xml: Support legacy screenshot tags again (Matthias Klumpp)

Translation:
 * Swedish
   - Anders Jonsson
 * Portuguese (Brazil)
   - Davi da Silva Böger
   - Rafael Fontenelle