[gimp] desktop: add <release> tags for 2.8.x.

[Jehan Pagès <jehanp src gnome org>]

commit 3595ef9dc51c6d4a1676043fb6ef4cd02cb71b63
Author: Jehan <jehan girinstud io>
Date:   Wed Dec 27 22:11:57 2017 +0100

    desktop: add <release> tags for 2.8.x.
    
    Did a bit of archeology to get all the dates back.
    I didn't add any description. Not sure if we should bother that much for
    older versions (but most probably for upcoming version, would be
    useful).
    I also wanted to add URLs to the various news for each release, but
    appstream-util would fail, telling that hyperlinks are not allowed
    inside <p>. Unfortunately <release> tag cannot have a <url> child (nor a
    property) according to appstream docs. So for now, I'll just stick to
    date listing.

 desktop/gimp.appdata.xml.in |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)
---
diff --git a/desktop/gimp.appdata.xml.in b/desktop/gimp.appdata.xml.in
index bfd18fb..cdfde88 100644
--- a/desktop/gimp.appdata.xml.in
+++ b/desktop/gimp.appdata.xml.in
@@ -62,4 +62,18 @@
   </kudos>
   <project_group>GNOME</project_group>
   <translation type="gettext">gimp20</translation>
+  <releases>
+    <release version="2.8.22" date="2017-05-11"/>
+    <release version="2.8.20" date="2017-02-01"/>
+    <release version="2.8.18" date="2016-07-14"/>
+    <release version="2.8.16" date="2015-11-22"/>
+    <release version="2.8.14" date="2014-08-26"/>
+    <release version="2.8.12" date="2014-08-25"/>
+    <release version="2.8.10" date="2013-11-28"/>
+    <release version="2.8.8"  date="2013-11-03" />
+    <release version="2.8.6"  date="2013-06-21"/>
+    <release version="2.8.4"  date="2013-02-05"/>
+    <release version="2.8.2"  date="2012-08-24"/>
+    <release version="2.8.0"  date="2012-05-03"/>
+  </releases>
 </component>