Code review. Thx ben-clayton for comments.

parse_version.cmake

@@ -1,4 +1,4 @@
-# Copyright 2020 The Marl Authors.
+# Copyright (C) 2020 Google, Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.