Update year in NOTICE

Author: TeslaCN

NOTICE

@@ -1,5 +1,5 @@
 Apache ShardingSphere
-Copyright 2018-2020 The Apache Software Foundation
+Copyright 2018-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

elasticjob-distribution/elasticjob-cloud-scheduler-distribution/src/main/release-docs/NOTICE

@@ -1,5 +1,5 @@
 Apache ShardingSphere
-Copyright 2018-2020 The Apache Software Foundation
+Copyright 2018-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).
@@ -484,4 +484,4 @@ Apache Mesos
 Copyright 2013, The Apache Software Foundation
 
 This product includes software developed at
-The Apache Software Foundation (http://www.apache.org/).
+The Apache Software Foundation (http://www.apache.org/).