Update documentation

README.md

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 # Pabulum SDK Instructions - Android
 
 [![](https://jitpack.io/v/elinkthings/PabulumSDKRepositoryAndroid.svg)](https://jitpack.io/#elinkthings/PabulumSDKRepositoryAndroid)
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 [key registration](http://sdk.aicare.net.cn)
 
-[中文文档](README_CN.md)
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 ## Conditions of Use
 1. Minimum version android4.4 (API 19)

README_CN.md

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 # 好营养SDK使用说明 - Android
 
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 [aar包下载地址](https://github.com/elinkthings/PabulumSDKRepositoryAndroid/releases)
 
-[English documentation](README.md)