Update README.md

Author: d-plaindoux

README.md

@@ -379,7 +379,7 @@ Others:
 
 ## License
 
-Copyright (C)2016-2019 Didier Plaindoux & Nicolas Zozol
+Copyright (C)2016-2020 Didier Plaindoux & Nicolas Zozol
 
 This program is  free software; you can redistribute  it and/or modify
 it  under the  terms  of  the GNU  Lesser  General  Public License  as