Fix (c) year.

The first release was in 2020

Change-Id: I468046da0902b2fa9d6e792af940579abeeca990
diff --git a/test/index.html b/test/index.html
index 2273093..2ee74df 100644
--- a/test/index.html
+++ b/test/index.html
@@ -1,7 +1,7 @@
 <!DOCTYPE html>
 <!--
 @license
-Copyright (C) 2018 The Android Open Source Project
+Copyright (C) 2020 The Android Open Source Project
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
@@ -25,4 +25,4 @@
   WCT.loadSuites([
     '../ui/code-owners-service_test.html'
   ]);
-</script>
\ No newline at end of file
+</script>