Extend copyright to 2016.
diff --git a/source/opcode.cpp b/source/opcode.cpp
index caaeddb..526933d 100644
--- a/source/opcode.cpp
+++ b/source/opcode.cpp
@@ -1,4 +1,4 @@
-// Copyright (c) 2015 The Khronos Group Inc.
+// Copyright (c) 2015-2016 The Khronos Group Inc.
 //
 // Permission is hereby granted, free of charge, to any person obtaining a
 // copy of this software and/or associated documentation files (the