chore: add some badges

README.md

@@ -1,3 +1,9 @@
 # @antv/G2
 
 2020.02.29 敬请期待！
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+[![](https://img.shields.io/travis/antvis/g2.svg)](https://travis-ci.org/antvis/g2)[![Coverage Status](https://coveralls.io/repos/github/antvis/G2/badge.svg?branch=fix-hustcc-demos)](https://coveralls.io/github/antvis/G2?branch=fix-hustcc-demos)[![NPM Package](https://img.shields.io/npm/v/@antv/g2.svg)](https://www.npmjs.com/package/@antv/g2)[![NPM Downloads](http://img.shields.io/npm/dm/@antv/g2.svg)](https://npmjs.org/package/@antv/g2)[![Percentage of issues still open](http://isitmaintained.com/badge/open/antvis/g2.svg)](http://isitmaintained.com/project/antvis/g2 'Percentage of issues still open')
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+![David](https://img.shields.io/david/antvis/G2)
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+![](https://img.shields.io/badge/language-typescript-red.svg)![](https://img.shields.io/badge/license-MIT-000000.svg)