README: fix license so that 'licensecheck' determines the right one

diff --git a/README b/README
index 7d47e8e..d420f7a 100644 (file)
--- a/README
+++ b/README
@@ -56,5 +56,5 @@ Example of use with identi.ca:
 
 [2] http://lzone.de/liferea/
 
-Tweeper is licensed under the GPLv3.
+Tweeper is licensed under the GPLv3 or later.
 Tweeper was written by Antonio Ospite https://ao2.it