Update mqtt_protocol_v5_SUITE.erl

test/mqtt_protocol_v5_SUITE.erl

@@ -1,5 +1,5 @@
 %%--------------------------------------------------------------------
-%% Copyright (c) 2019 EMQ Technologies Co., Ltd. All Rights Reserved.
+%% Copyright (c) 2020 EMQ Technologies Co., Ltd. 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.