Change license year

Author: dimitrytarasov

README.md

@@ -122,7 +122,7 @@ $transport = new ExecTransport($apiKey, ['debug' => true]);
 
 ## License
 
-Copyright 2014 Stackify, LLC.
+Copyright 2015 Stackify, LLC.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.