[gnome-multi-writer] trivial: Add another tag to the AppData file

[Richard Hughes <rhughes src gnome org>]

commit 2b46526ea47e03f6c1f6f9ade4d92f19480b079b
Author: Richard Hughes <richard hughsie com>
Date:   Fri Jan 22 17:10:22 2016 +0000

    trivial: Add another tag to the AppData file

 data/appdata/org.gnome.MultiWriter.appdata.xml.in |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/data/appdata/org.gnome.MultiWriter.appdata.xml.in 
b/data/appdata/org.gnome.MultiWriter.appdata.xml.in
index 6fdc501..6c91332 100644
--- a/data/appdata/org.gnome.MultiWriter.appdata.xml.in
+++ b/data/appdata/org.gnome.MultiWriter.appdata.xml.in
@@ -157,6 +157,7 @@
     <kudo>HiDpiIcon</kudo>
     <kudo>ModernToolkit</kudo>
   </kudos>
+  <project_group>GNOME</project_group>
   <url type="homepage">https://wiki.gnome.org/Apps/MultiWriter</url>
   <url type="bugtracker">https://bugzilla.gnome.org/browse.cgi?product=gnome-multi-writer</url>
   <update_contact>richard_at_hughsie.com</update_contact>