Update README.md

Mike-mei · web-flow · commit 3f123c1673c2 · 2021-02-20T13:58:09.000+08:00
diff --git a/README.md b/README.md
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 # HMS Pushkit Java Severdemo
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+English | [中文](https://github.com/HMS-Core/hms-push-serverdemo-java/blob/master/README_ZH.md)
 
 ## Table of Contents
 
