revert original copyright year of file

mcshooter · mcshooter · commit 4e7fa06b32fd · 2021-04-15T21:27:45.000Z
diff --git a/pkg/healthchecker/types/types_test.go b/pkg/healthchecker/types/types_test.go
@@ -1,5 +1,5 @@
 /*
-Copyright 2020 The Kubernetes Authors All rights reserved.
+Copyright 2021 The Kubernetes Authors 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.
