[gnome-nibbles] Add license header to preferences-dialog.vala

[Iulian Radu <iulianradu src gnome org>]

commit 69ab58ff4d7e18a2424a025bd747c6d1a76b90ee
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Thu Feb 18 19:07:00 2016 -0600

    Add license header to preferences-dialog.vala
    
    https://bugzilla.gnome.org/show_bug.cgi?id=762297

 src/preferences-dialog.vala |   18 ++++++++++++++++++
 1 files changed, 18 insertions(+), 0 deletions(-)
---
diff --git a/src/preferences-dialog.vala b/src/preferences-dialog.vala
index f4afa1a..b257586 100644
--- a/src/preferences-dialog.vala
+++ b/src/preferences-dialog.vala
@@ -1,3 +1,21 @@
+/* -*- Mode: vala; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * Gnome Nibbles: Gnome Worm Game
+ * Copyright (C) 2015 Gabriel Ivascu <ivascu gabriel59 gmail com>
+ *
+ * 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/>.
+ */
+
 [GtkTemplate (ui = "/org/gnome/nibbles/ui/preferences-dialog.ui")]
 private class PreferencesDialog : Gtk.Dialog
 {