bump readme

README.md

@@ -31,7 +31,7 @@ Please refer to the [Morfeu](https://github.com/danigiri/morfeu) documentation f
 
 ## License
 
-> Copyright 2020 Daniel Giribet
+> Copyright 2021 Daniel Giribet
 >
 > Licensed under the Apache License, Version 2.0 (the "License");
 > you may not use this file except in compliance with the License.