经历了长达3年多的 v16.x，react 终于迎来了一个大版本号的升级
https://reactjs.org/blog/2020/10/20/react-v17.html

没有新功能

breaking changes:
In React 16 and earlier, React would do document.addEventListener() for most events. React 17 will call rootNode.addEventListener() under the hood instead.
其它的都在 rc blog：
https://reactjs.org/blog/2020/08/10/react-v17-rc.html#other-breaking-changes
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