Update README.md

Author: 愿乘风归去

README.md

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 # Aria2Py
 Aria2 RPC client in python3.  [aria2,"The next generation download utility."](https://aria2.github.io/)
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+aria2py是基于Python3 写的 Aria2 RPC 客户端. aria2py通过aria2 server 的 xml-RPC接口和功能控制aria2
+[中文介绍文档](https://github.com/Masterchiefm/Aria2Py/blob/main/README_zh.md)
 # Description
 aria2py controls aria2 via its xml-RPC interface and features