Update operators.py

ppcls/data/preprocess/ops/operators.py

 """
-# Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved
+# Copyright (c) 2021 PaddlePaddle 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.