Update README.md

Update license for 2020.

README.md

@@ -175,7 +175,7 @@ kubectl delete -f https://raw.githubusercontent.com/rancher/local-path-provision
 
 ## License
 
-Copyright (c) 2014-2018  [Rancher Labs, Inc.](http://rancher.com/)
+Copyright (c) 2014-2020  [Rancher Labs, Inc.](http://rancher.com/)
 
 Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at