[gnome-nibbles] appdata: Update project license

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 8648483eb4e71d721823db8efc05fff13433b949
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Sun Feb 14 21:42:29 2016 -0600

    appdata: Update project license

 data/org.gnome.Nibbles.appdata.xml.in |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/data/org.gnome.Nibbles.appdata.xml.in b/data/org.gnome.Nibbles.appdata.xml.in
index 24e4432..77c8627 100644
--- a/data/org.gnome.Nibbles.appdata.xml.in
+++ b/data/org.gnome.Nibbles.appdata.xml.in
@@ -3,7 +3,7 @@
 <component type="desktop">
   <id>org.gnome.Nibbles.desktop</id>
   <metadata_license>CC0-1.0</metadata_license>
-  <project_license>GPL-2.0+ and CC-BY-SA-3.0</project_license>
+  <project_license>GPL-3.0+ and CC-BY-SA-3.0</project_license>
   <_name>GNOME Nibbles</_name>
   <_summary>Guide a worm around a maze</_summary>
   <description>