Update README.md

Author: dengshiwei

README.md

@@ -84,7 +84,7 @@ See our [full manual](http://www.sensorsdata.cn/manual/android_sdk.html)
 
 ## License
 
-Copyright 2015－2020 Sensors Data Inc.
+Copyright 2015－2021 Sensors Data Inc.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.