Bump the copyright years

bbatsov · bbatsov · commit f8e081f1082a · 2021-04-06T15:33:45.000+03:00
diff --git a/README.md b/README.md
@@ -135,7 +135,7 @@ Let's also acknowledge some of the projects leveraged by cider-nrepl:
 
 ## License
 
-Copyright © 2013-2020 Bozhidar Batsov
+Copyright © 2013-2021 Bozhidar Batsov
 
 Distributed under the Eclipse Public License, the same as Clojure.
 
