Update copyright date to 2016
diff --git a/examples/protos/helloworld.proto b/examples/protos/helloworld.proto
index 0bee1fc..ad3ad3a 100644
--- a/examples/protos/helloworld.proto
+++ b/examples/protos/helloworld.proto
@@ -1,4 +1,4 @@
-// Copyright 2015, Google Inc.
+// Copyright 2016, Google Inc.
 // All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without