Remove extraneous copyright year.
diff --git a/yapftests/main_test.py b/yapftests/main_test.py
index 508c02c..138853c 100644
--- a/yapftests/main_test.py
+++ b/yapftests/main_test.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-# Copyright 2015-2017 Google Inc. All Rights Reserved.
+# Copyright 2015 Google Inc. All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.