[four-in-a-row] appdata: update license metadata

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 9665644f8a2bdfc010f2a6d2b1edfaa6653970d5
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Sun May 11 17:04:49 2014 -0500

    appdata: update license metadata

 data/four-in-a-row.appdata.xml.in |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/data/four-in-a-row.appdata.xml.in b/data/four-in-a-row.appdata.xml.in
index b0ca217..4430114 100644
--- a/data/four-in-a-row.appdata.xml.in
+++ b/data/four-in-a-row.appdata.xml.in
@@ -2,7 +2,8 @@
 <!-- Copyright 2013 Michael Catanzaro -->
 <application>
  <id type="desktop">four-in-a-row.desktop</id>
- <licence>CC0</licence>
+ <metadata_licence>CC0-1.0</metadata_licence>
+ <project_license>GPL-2.0+ and GPL-3.0+ and CC-BY-SA-3.0</project_license>
  <description>
   <_p>
    A family classic, the objective of Four-in-a-row is to build a line of four