Support react new syntax

[HillLiu]

Remove import react

import React from "react"

React 17 RC already includes support for the new transform, so go give it a try! To make it easier to adopt, we’ve also backported its support to React 16.14.0, React 15.7.0, and React 0.14.10. You can find the upgrade instructions for different tools below.

• https://reactjs.org/blog/2020/09/22/introducing-the-new-jsx-transform.html#:~:text=React%2017%20RC%20already%20includes%20support%20for%20the%20new%20transform%2C%20so%20go%20give%20it%20a%20try!%20To%20make%20it%20easier%20to%20adopt%2C%20we%E2%80%99ve%20also%20backported%20its%20support%20to%20React%2016.14.0%2C%20React%2015.7.0%2C%20and%20React%200.14.10.%20You%20can%20find%20the%20upgrade%20instructions%20for%20different%20tools%20below.

• https://github.com/reactjs/rfcs/blob/createlement-rfc/text/0000-create-element-changes.md#motivation

• https://reactjs.org/blog/2020/09/22/introducing-the-new-jsx-transform.html