[gnome-photos] appdata: Add copyright notice and update license fields

[Debarshi Ray <debarshir src gnome org>]

commit 1268470165e2a8929ea1ff2cb3397476e66a7ff1
Author: Pranav Kant <pranav913 gmail com>
Date:   Sun Jun 15 03:03:10 2014 +0530

    appdata: Add copyright notice and update license fields
    
    See:
    http://blogs.gnome.org/hughsie/2014/05/02/appdata-meet-spdx-spdx-meet-appdata/

 data/org.gnome.Photos.appdata.xml.in |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/data/org.gnome.Photos.appdata.xml.in b/data/org.gnome.Photos.appdata.xml.in
index 5be0b5c..d4e65d0 100644
--- a/data/org.gnome.Photos.appdata.xml.in
+++ b/data/org.gnome.Photos.appdata.xml.in
@@ -1,7 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!-- Copyright 2013, 2014 Red Hat, Inc. -->
 <application>
   <id type="desktop">org.gnome.Photos.desktop</id>
-  <licence>CC0</licence>
+  <metadata_license>CC0-1.0</metadata_license>
+  <project_license>GPL-2.0+</project_license>
   <name>Photos</name>
   <summary>Access, organize and share your photos on GNOME</summary>
   <description>