Improvements to badges in README (ant-design#13743)

* 📝 Use flat badges where possible

* 📝 Add LGTM.com badge in README

README-zh_CN.md

@@ -12,13 +12,15 @@
 
 [![CircleCI branch](https://img.shields.io/circleci/project/github/ant-design/ant-design/master.svg?style=flat-square)](https://circleci.com/gh/ant-design/ant-design)
 [![Codecov](https://img.shields.io/codecov/c/github/ant-design/ant-design/master.svg?style=flat-square)](https://codecov.io/gh/ant-design/ant-design/branch/master)
-[![Dependencies](https://img.shields.io/david/ant-design/ant-design.svg)](https://david-dm.org/ant-design/ant-design)
-[![DevDependencies](https://img.shields.io/david/dev/ant-design/ant-design.svg)](https://david-dm.org/ant-design/ant-design?type=dev)
+[![Total alerts](https://img.shields.io/lgtm/alerts/g/ant-design/ant-design.svg?logo=lgtm&logoWidth=18&style=flat-square)](https://lgtm.com/projects/g/ant-design/ant-design/alerts/)
+[![Language grade: JavaScript](https://img.shields.io/lgtm/grade/javascript/g/ant-design/ant-design.svg?logo=lgtm&logoWidth=18&style=flat-square)](https://lgtm.com/projects/g/ant-design/ant-design/context:javascript)
+[![Dependencies](https://img.shields.io/david/ant-design/ant-design.svg?style=flat-square)](https://david-dm.org/ant-design/ant-design)
+[![DevDependencies](https://img.shields.io/david/dev/ant-design/ant-design.svg?style=flat-square)](https://david-dm.org/ant-design/ant-design?type=dev)
 
 [![npm package](https://img.shields.io/npm/v/antd.svg?style=flat-square)](https://www.npmjs.org/package/antd)
 [![NPM downloads](http://img.shields.io/npm/dm/antd.svg?style=flat-square)](http://npmjs.com/antd)
 [![Percentage of issues still open](http://isitmaintained.com/badge/open/ant-design/ant-design.svg)](http://isitmaintained.com/project/ant-design/ant-design "Percentage of issues still open")
-[![Gitter](https://badges.gitter.im/ant-design/ant-design-english.svg)](https://gitter.im/ant-design/ant-design-english?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)(🇺🇸)
+[![Gitter](https://img.shields.io/gitter/room/ant-design/ant-design-english.svg?style=flat-square)](https://gitter.im/ant-design/ant-design-english?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)(🇺🇸)
 [![Join the chat at https://gitter.im/ant-design/ant-design](https://img.shields.io/gitter/room/ant-design/ant-design.svg?style=flat-square)](https://gitter.im/ant-design/ant-design?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)(🇨🇳)
 
 </div>

README.md

@@ -12,13 +12,15 @@ An enterprise-class UI design language and React-based implementation.
 
 [![CircleCI branch](https://img.shields.io/circleci/project/github/ant-design/ant-design/master.svg?style=flat-square)](https://circleci.com/gh/ant-design/ant-design)
 [![Codecov](https://img.shields.io/codecov/c/github/ant-design/ant-design/master.svg?style=flat-square)](https://codecov.io/gh/ant-design/ant-design/branch/master)
-[![Dependencies](https://img.shields.io/david/ant-design/ant-design.svg)](https://david-dm.org/ant-design/ant-design)
-[![DevDependencies](https://img.shields.io/david/dev/ant-design/ant-design.svg)](https://david-dm.org/ant-design/ant-design?type=dev)
+[![Total alerts](https://img.shields.io/lgtm/alerts/g/ant-design/ant-design.svg?logo=lgtm&logoWidth=18&style=flat-square)](https://lgtm.com/projects/g/ant-design/ant-design/alerts/)
+[![Language grade: JavaScript](https://img.shields.io/lgtm/grade/javascript/g/ant-design/ant-design.svg?logo=lgtm&logoWidth=18&style=flat-square)](https://lgtm.com/projects/g/ant-design/ant-design/context:javascript)
+[![Dependencies](https://img.shields.io/david/ant-design/ant-design.svg?style=flat-square)](https://david-dm.org/ant-design/ant-design)
+[![DevDependencies](https://img.shields.io/david/dev/ant-design/ant-design.svg?style=flat-square)](https://david-dm.org/ant-design/ant-design?type=dev)
 
 [![npm package](https://img.shields.io/npm/v/antd.svg?style=flat-square)](https://www.npmjs.org/package/antd)
 [![NPM downloads](http://img.shields.io/npm/dm/antd.svg?style=flat-square)](http://npmjs.com/antd)
 [![Percentage of issues still open](http://isitmaintained.com/badge/open/ant-design/ant-design.svg)](http://isitmaintained.com/project/ant-design/ant-design "Percentage of issues still open")
-[![Gitter](https://badges.gitter.im/ant-design/ant-design-english.svg)](https://gitter.im/ant-design/ant-design-english?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)(🇺🇸)
+[![Gitter](https://img.shields.io/gitter/room/ant-design/ant-design-english.svg?style=flat-square)](https://gitter.im/ant-design/ant-design-english?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)(🇺🇸)
 [![Join the chat at https://gitter.im/ant-design/ant-design](https://img.shields.io/gitter/room/ant-design/ant-design.svg?style=flat-square)](https://gitter.im/ant-design/ant-design?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)(🇨🇳)
 
 </div>