doc: Update README.md

Author: jaywcjlove

README.md

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 # magic-input
 
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+[![Downloads](https://img.shields.io/npm/dm/magic-input.svg?style=flat)](https://www.npmjs.com/package/magic-input)
+[![CI](https://github.com/jaywcjlove/magic-input/actions/workflows/ci.yml/badge.svg)](https://github.com/jaywcjlove/magic-input/actions/workflows/ci.yml)
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 CSS3 Styles for Checkbox and Radio Button inputs look prettier. with only one element. [Live demo](https://jaywcjlove.github.io/magic-input)