doc: Update README.md

uiwjs · Jul 15, 2021 · 353ec42 · 353ec42
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 [`Keycode Info`](https://uiwjs.github.io/keycode-info)
 
+[![Coverage Status](https://coveralls.io/repos/github/uiwjs/keycode-info/badge.svg?branch=main)](https://coveralls.io/github/uiwjs/keycode-info?branch=main)
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 JavaScript Keycodes of [KeyboardEvent](https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent)
 
 https://uiwjs.github.io/keycode-info