changed text to lesser gpl in one sentence..

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@1149 44740490-163a-0410-bde0-09ae8108e29a

COPYING

@@ -15,7 +15,7 @@ If you are going to use simpleSAMLphp in a commercial context, and you want to u
 
 --
 simpleSAMLphp is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
+it under the terms of the GNU Lesser General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.