Update README_ZH.md

Mike-mei · web-flow · commit 81fc671645fd · 2021-02-20T13:58:45.000+08:00
diff --git a/README_ZH.md b/README_ZH.md
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 # 华为推送服务服务端Java示例代码
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+[English](https://github.com/HMS-Core/hms-push-serverdemo-java) | 中文
 
 ## 目录
 
