Update README-zh.md

README-zh.md

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 <img src="https://github.com/Tencent/spring-cloud-tencent/raw/2021.0/doc/logo/rectangle-white.png" width="60%" height="60%"  alt="Spring-Cloud-Tencent-Logo"/>
 
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 [English](./README.md) | 简体中文
 
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