[gbrainy] Add a missing tag to the AppData file

[Richard Hughes <rhughes src gnome org>]

commit 2fdbd60583975301223f614d72ae0657783e1003
Author: Richard Hughes <richard hughsie com>
Date:   Mon Jan 25 13:35:52 2016 +0000

    Add a missing tag to the AppData file

 data/gbrainy.appdata.xml.in |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/data/gbrainy.appdata.xml.in b/data/gbrainy.appdata.xml.in
index 4ab005d..345d026 100644
--- a/data/gbrainy.appdata.xml.in
+++ b/data/gbrainy.appdata.xml.in
@@ -19,4 +19,5 @@
   </screenshots>
   <url type="homepage">https://wiki.gnome.org/action/show/Apps/gbrainy/</url>
   <updatecontact>jmas_at_softcatala_dot_org</updatecontact>
+  <project_group>GNOME</project_group>
 </application>