Update readme.md

wwj718 · web-flow · commit 19c3b55be3f9 · 2019-08-28T12:00:16.000+08:00
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 # readme
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 [开源与机器学习相关的Scratch插件](http://blog.just4fun.site/scratch-extension-knn)
+
+
+ref: [创建你的第一个Scratch3.0 Extension](https://blog.just4fun.site/create-first-Scratch3-Extension.html)
