Update copyright notice from 2017 to 2018 (#111)

Author: besirkurtulmus

README.rst

@@ -56,7 +56,8 @@ SageMaker Python SDK is tested on: \* Python 2.7 \* Python 3.5
 
 Licensing
 ~~~~~~~~~
-SageMaker Python SDK is licensed under the Apache 2.0 License. It is copyright 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved. The license is available at:  http://aws.amazon.com/apache2.0/
+SageMaker Python SDK is licensed under the Apache 2.0 License. It is copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved. The license is available at:  
+http://aws.amazon.com/apache2.0/
 
 Running tests
 ~~~~~~~~~~~~~