fix: add current year into LICENSE (#125)

Author: sriram-mv

LICENSE

@@ -187,7 +187,7 @@
       same "printed page" as the copyright notice for easier
       identification within third-party archives.
 
-   Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+   Copyright 2018-2019 Amazon.com, Inc. or its affiliates. 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.