Update README.md

Author: phasenraum2010

README.md

@@ -116,9 +116,11 @@ If you _really really_ like it and want to support the author, I will be glad to
 
 © 2017 Thomas Wöhlke
 
-Licensed under the GNU General Public License Version 2.0
+Licensed under the Apache License, Version 2.0
+
+http://www.apache.org/licenses/LICENSE-2.0
+
 
-http://www.gnu.org/licenses/old-licenses/gpl-2.0