update copyright year

c68e22cf · Michael Leuschel · 69b8da1e · c68e22cf
Commit c68e22cf authored Jan 21, 2021 by Michael Leuschel
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@
 [![Build Status](https://travis-ci.org/hhu-stups/prob-rodinplugin.svg?branch=develop)](https://travis-ci.org/hhu-stups/prob-rodinplugin)

 The ProB source code is distributed under the EPL license (http://www.eclipse.org/org/documents/epl-v10.html).
-(C) 2000-2020 Michael Leuschel and many others.
+(C) 2000-2021 Michael Leuschel and many others.

 For updates please visit the ProB website: https://www3.hhu.de/stups/prob/