README.md in postmark-rails-0.20.0 vs README.md in postmark-rails-0.21.0

@@ -110,6 +110,6 @@
 The Postmark Rails gem is licensed under the [MIT](http://www.opensource.org/licenses/mit-license.php) license.
 Refer to the [LICENSE](https://github.com/wildbit/postmark-rails/blob/master/LICENSE) file for more information.
 
 ## Copyright
 
-Copyright © 2020 Wildbit LLC.
+Copyright © 2021 Wildbit LLC.