add copyright notice

diff --git a/mubot4fb.pl b/mubot4fb.pl
index 3c6136c..083ee7d 100755 (executable)
--- a/mubot4fb.pl
+++ b/mubot4fb.pl
@@ -1,4 +1,8 @@
 #!/usr/bin/perl
+#
+# Copyright (c) 2012 ISHIKAWA Mutsumi <ishikawa@hanzubon.jp>
+# This program is covered by the GNU General Public License 2
+#
 package Mubot4FB;
 
 use strict;