Update LICENSE with License Copyright Years (#331)

Update LICENSE Also added 2021 CY year.

Author: Andrew Choi

LICENSE

@@ -186,7 +186,7 @@
  same "printed page" as the copyright notice for easier
  identification within third-party archives.
 
- Copyright 2016 LinkedIn Corp. All rights reserved.
+ Copyright 2016, 2017, 2018, 2019, 2020, 2021 LinkedIn Corp. All rights reserved.
 
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.