[pitivi] Add a missing tag to the AppData file

[Richard Hughes <rhughes src gnome org>]

commit 4dfb1196dacc99d81946aacfba898040837e9434
Author: Richard Hughes <richard hughsie com>
Date:   Mon Jan 25 13:09:06 2016 +0000

    Add a missing tag to the AppData file

 data/pitivi.appdata.xml.in |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/data/pitivi.appdata.xml.in b/data/pitivi.appdata.xml.in
index 51c81e4..4fe5142 100644
--- a/data/pitivi.appdata.xml.in
+++ b/data/pitivi.appdata.xml.in
@@ -26,4 +26,5 @@
   <kudo>Notifications</kudo>
  </kudos>
  <updatecontact>nekohayo gmail com</updatecontact>
+ <project_group>GNOME</project_group>
 </application>