[AppStream] AppStream Generator 0.9.0 released!

[Matthias Klumpp]

Hi!
A new maintenance release of appstream-generator, brings compatibility
with AppStream 0.16.0 and fixes a few minor issues.

Tarballs available here: https://github.com/ximion/appstream-generator/releases

Version 0.9.0
~~~~~~~~~~~~~~
Released: 2023-01-26

Features:
 * Allow more complex repo-level metadata additions

Documentation:
 * docs: Document modifications.json
 * docs: document values of "Backend" in asgen config
 * docs: clarify directory structure

Bugfixes:
 * Make MetadataType override work again
 * Ensure all user feature flags are applied properly again
 * Retry failed download 4 times by default
 * Even process an empty repository if action is forced
 * Don't fail if icon directory for injected metadata is missing
 * ci: Improve scripts and don't use deprecated commands
 * ci: Install ffmpeg in the Fedora images

Contributors:
 Matthias Klumpp, Miroslav Suchý, Neal Gompa

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