[AppStream] AppStream 0.12.9 released!

[Matthias Klumpp]

Hello!
This release contains a few new features for appstreamcli, a bunch of
minor specification additions and documentation refinements and a lot
of bug fixes and new translations.
Have fun!
    Matthias

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

Version 0.12.9
~~~~~~~~~~~~~~
Released: 2019-09-24

Features:
 * validator: Add method to retrieve list of all tags
 * ascli: Add command to make a desktop-entry file from a metainfo file
 * ascli: Add command for YAMl NEWS file conversion
 * ascli: Convert text NEWS file as well
 * Recognize Specification/Documentation as new section type when
converting NEWS
 * Augment metainfo file with release information automatically
 * Use gperf for description markup as well
 * validator: Make file-extension checks work with complex URIs
 * Implement support for release issues

Specification:
 * docs: Actually give a metadata license recommendation
 * Document the issue tag, which can be part of release information
 * spec: Explicitly allow WebP for images in metainfo files
 * Permit requires/recommends relations on firmware, like Fwupd uses

Bugfixes:
 * docs: Move compulsory_for_desktop where it belongs
 * docs: Mention how to exclude .desktop files from being processed
 * Make -Wdeprecated-copy non-fatal in maintainer mode for now
 * cache: Relax LMDB database max size assumption a bit to help 32bit builds
 * validator: Don't crash in assertion if we have no filename
 * Catch more errors when parsing YAML and _ref less often
 * Interleave translated/untranslated paragraphs when generating metainfo XML
 * Don't format cached XML
 * Don't emit language tag for screenshot if it is unnecessary
 * docs: Add missing documentation to API reference
 * docs: Document a few missing ascli subcommands

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