[banshee] Add a missing tag to the AppData file

[Richard Hughes <rhughes src gnome org>]

commit 2dc13b1a55e49b0eb2e79266d91cd2954dddf200
Author: Richard Hughes <richard hughsie com>
Date:   Mon Jan 25 13:06:43 2016 +0000

    Add a missing tag to the AppData file

 data/banshee.appdata.xml.in |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/data/banshee.appdata.xml.in b/data/banshee.appdata.xml.in
index 59b0a56..d53c0cc 100644
--- a/data/banshee.appdata.xml.in
+++ b/data/banshee.appdata.xml.in
@@ -22,4 +22,5 @@
   </screenshots>
   <url type="homepage">http://banshee.fm/</url>
   <updatecontact>banshee-list_at_gnome.org</updatecontact>
+  <project_group>GNOME</project_group>
 </application>