Update zh.md

4 years ago · 925056726e
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 [![FOSSA Status](https://app.fossa.com/api/projects/git%2Bgithub.com%2FIoTcat%2FLoRa-mqtt.svg?type=shield)](https://app.fossa.com/projects/git%2Bgithub.com%2FIoTcat%2FLoRa-mqtt?ref=badge_shield)
 ![size](https://badge-size.herokuapp.com/iotcat/LoRa-mqtt/master/lora-mqtt.h)

-在LoRa通信中使用MQTT协议..   
+在LoRa通信中使用MQTT协议..     
+
+[English Version](./README.md)

 ## 使用案例 - 使用回调函数
 ```C++