[goobox] appdata: added project license, use SPDX strings

[Paolo Bacchilega <paobac src gnome org>]

commit f54d393dfc437885feb4bf7709e040dd0aced27d
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Fri May 2 19:30:14 2014 +0200

    appdata: added project license, use SPDX strings

 data/appdata/goobox.appdata.xml.in |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/data/appdata/goobox.appdata.xml.in b/data/appdata/goobox.appdata.xml.in
index 2bbafc2..ac37e6c 100644
--- a/data/appdata/goobox.appdata.xml.in
+++ b/data/appdata/goobox.appdata.xml.in
@@ -1,8 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<!-- Copyright 2013 Paolo Bacchilega <paobac src gnome org> -->
+<!-- Copyright 2013-2014 Paolo Bacchilega <paobac src gnome org> -->
 <application>
   <id type="desktop">goobox.desktop</id>
-  <licence>CC0</licence>
+  <metadata_license>CC0-1.0</metadata_license>
+  <project_license>GPL-2.0+</project_license>
   <_name>Goobox CD Player</_name>
   <description>
     <_p>