[baobab] Add a missing tag to the AppData file

[Richard Hughes <rhughes src gnome org>]

commit 8328b55b14fcac46b527f190d7676903602a5a89
Author: Richard Hughes <richard hughsie com>
Date:   Mon Jan 25 13:11:05 2016 +0000

    Add a missing tag to the AppData file

 data/org.gnome.baobab.appdata.xml.in |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/data/org.gnome.baobab.appdata.xml.in b/data/org.gnome.baobab.appdata.xml.in
index 4ecaa56..098259b 100644
--- a/data/org.gnome.baobab.appdata.xml.in
+++ b/data/org.gnome.baobab.appdata.xml.in
@@ -20,4 +20,5 @@
   </kudos>
   <url type="homepage">https://wiki.gnome.org/Apps/Baobab</url>
   <updatecontact>stefano.facchini_at_gmail.com</updatecontact>
+  <project_group>GNOME</project_group>
 </application>