add proper license

98acc9af · Roman Haefeli · bc19ac81 · 98acc9af · 98acc9af
Commit 98acc9af authored Mar 15, 2018 by Roman Haefeli
--- a/LICENSE.txt
+++ b/LICENSE.txt
--- a/README.txt
+++ b/README.txt
@@ -74,5 +74,5 @@ Authors
 License
 -------

-TO_BE_DEFINED
+  GPL 3.0 (see LICENSE.txt)