[gnome-nibbles] appdata: add a copyright line

[Michael Catanzaro <mcatanzaro src gnome org>]

commit fafbd471e4f768cf1b9e5d5ceada472eadae7a0d
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Sun Oct 6 09:33:46 2013 -0500

    appdata: add a copyright line

 data/gnome-nibbles.appdata.xml.in |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/data/gnome-nibbles.appdata.xml.in b/data/gnome-nibbles.appdata.xml.in
index fb0274f..ad2be27 100644
--- a/data/gnome-nibbles.appdata.xml.in
+++ b/data/gnome-nibbles.appdata.xml.in
@@ -1,4 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!-- Copyright 2013 Michael Catanzaro -->
 <application>
  <id type="desktop">gnibbles.desktop</id>
  <licence>CC0</licence>