improve GPL license info

update-index-ssh-link.sh

@@ -1,3 +1,20 @@
+#  update-index-ssh-link.sh
+#  
+#  Copyright (C) 2015 Max Mehl <mail@mehl.mx>
+#  
+#  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/>.
+#  
 #!/bin/sh
 
 HOST=$(basename $1)