[gimp] desktop: add (commented-out) release tag for 2.10.

[Jehan Pagès <jehanp src gnome org>]

commit a017668b09065231d575505ea19c668005c2e7ef
Author: Jehan <jehan girinstud io>
Date:   Wed Dec 27 23:04:26 2017 +0100

    desktop: add (commented-out) release tag for 2.10.
    
    Let's start from here. I don't think it needs to be too long, just a
    summary of the most awesome changes, I'd say.
    Let's leave it commented out for now, until the description is finished
    and ready for localization. This is the description which may appear in
    software installers using appstream metadata.

 desktop/gimp.appdata.xml.in |   44 +++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 44 insertions(+), 0 deletions(-)
---
diff --git a/desktop/gimp.appdata.xml.in b/desktop/gimp.appdata.xml.in
index cdfde88..246d572 100644
--- a/desktop/gimp.appdata.xml.in
+++ b/desktop/gimp.appdata.xml.in
@@ -63,6 +63,50 @@
   <project_group>GNOME</project_group>
   <translation type="gettext">gimp20</translation>
   <releases>
+  <!--
+    <release version="2.10.0" date="TODO">
+      <description>
+        <_p>
+          First release of the 2.10 series which prominently features
+          the port to a new image processing engine, GEGL.
+          The most outstanding changes are:
+        </_p>
+        <ul>
+          <_li>
+            Up to 32-bit per color channel
+          </_li>
+          <_li>
+            On-canvas effect previews
+          </_li>
+          <_li>
+            Multi-threaded and hardware-accelerated rendering and
+            processing
+          </_li>
+          <_li>
+            Many new and improved tools
+          </_li>
+          <_li>
+            Color-management improvements
+          </_li>
+          <_li>
+            Many file format improvements and new formats support:
+            OpenEXR, WebP, HGT…
+          </_li>
+          <_li>
+            Metadata viewing and editing
+          </_li>
+          <_li>
+            Improved digital painting: canvas rotation and
+            flipping, symmetry painting, MyPaint brush support…
+          </_li>
+            Better HiDPI support.
+          <_li>
+            And much, much more…
+          </_li>
+        </ul>
+      </description>
+    </release>
+    -->
     <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"/>