scripts: Update copyrights

Change-Id: I7dbf24883b90bd54425c6b64592130d8f3b80012
diff --git a/layers/generated/parameter_validation.cpp b/layers/generated/parameter_validation.cpp
index b7f8da4..411c719 100644
--- a/layers/generated/parameter_validation.cpp
+++ b/layers/generated/parameter_validation.cpp
@@ -1,9 +1,9 @@
 /* *** THIS FILE IS GENERATED - DO NOT EDIT! ***
  * See parameter_validation_generator.py for modifications
  *
- * Copyright (c) 2015-2018 The Khronos Group Inc.
- * Copyright (c) 2015-2018 LunarG, Inc.
- * Copyright (C) 2015-2018 Google Inc.
+ * Copyright (c) 2015-2019 The Khronos Group Inc.
+ * Copyright (c) 2015-2019 LunarG, Inc.
+ * Copyright (C) 2015-2019 Google Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.