Update README.md

CodeLabClub · Aug 28, 2019 · 9589444 · 9589444
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 此插件使用[pymata-io](https://github.com/bilikyar/pymata-aio)库作为Arduino_nano的固件。
 
 如果有什么问题，尽管开issue，欢迎来交流。
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+ref: [创建你的第一个Scratch3.0 Extension](https://blog.just4fun.site/create-first-Scratch3-Extension.html)