[gnome-tweak-tool] Add license notice to main script

[John Stowers <jstowers src gnome org>]

commit abb81e770cf24a02e2483c9c1be62853e9a211cd
Author: John Stowers <john stowers gmail com>
Date:   Tue Mar 22 21:42:46 2011 +1300

    Add license notice to main script

 NEWS             |    1 +
 gnome-tweak-tool |   13 +++++++++++++
 2 files changed, 14 insertions(+), 0 deletions(-)
---
diff --git a/NEWS b/NEWS
index 770c4c4..f7fb56f 100644
--- a/NEWS
+++ b/NEWS
@@ -1,4 +1,5 @@
 2.91.XX
+    * Add license (GPL3)
     * Tweak shell clock to show date
 
 2.91.92
diff --git a/gnome-tweak-tool b/gnome-tweak-tool
index 892261b..be3a3d9 100755
--- a/gnome-tweak-tool
+++ b/gnome-tweak-tool
@@ -1,5 +1,18 @@
 #!/usr/bin/env python
 
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 import os.path
 import optparse