chore: fix readme typo (#5250)

README.md

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 [![travis-ci](https://img.shields.io/travis/antvis/g6/master.svg)](https://travis-ci.org/antvis/g6) [![codecov](https://codecov.io/gh/antvis/G6/branch/master/graph/badge.svg)](https://codecov.io/gh/antvis/G6) ![typescript](https://img.shields.io/badge/language-typescript-red.svg) ![MIT](https://img.shields.io/badge/license-MIT-000000.svg) [![npm package](https://img.shields.io/npm/v/@antv/g6.svg)](https://www.npmjs.com/package/@antv/g6) [![NPM downloads](http://img.shields.io/npm/dm/@antv/g6.svg)](https://npmjs.org/package/@antv/g6) [![Percentage of issues still open](http://isitmaintained.com/badge/open/antvis/g6.svg)](http://isitmaintained.com/project/antvis/g6 'Percentage of issues still open')
 
-[中文 README](README.zh-CN.md)
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 ## What is G6
 
 [G6](https://github.com/antvis/g6) is a graph visualization engine, which provides a set of basic mechanisms, including rendering, layout, analysis, interaction, animation, and other auxiliary tools. G6 aims to simplify the relationships, and help people to obtain the insight of relational data. Developers are able to build graph visualization **analysis** applications or graph visualization **modeling** applications easily.

README.zh-CN.md

@@ -8,8 +8,6 @@
 
 [![travis-ci](https://img.shields.io/travis/antvis/g6.svg)](https://travis-ci.org/antvis/g6) [![codecov](https://codecov.io/gh/antvis/G6/branch/master/graph/badge.svg)](https://codecov.io/gh/antvis/G6) ![typescript](https://img.shields.io/badge/language-typescript-red.svg) ![MIT](https://img.shields.io/badge/license-MIT-000000.svg) [![npm package](https://img.shields.io/npm/v/@antv/g6.svg)](https://www.npmjs.com/package/@antv/g6) [![NPM downloads](http://img.shields.io/npm/dm/@antv/g6.svg)](https://npmjs.org/package/@antv/g6) [![Percentage of issues still open](http://isitmaintained.com/badge/open/antvis/g6.svg)](http://isitmaintained.com/project/antvis/g6 'Percentage of issues still open')
 
-[English README](README.md)
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 ## 什么是 G6
 
 [G6](https://github.com/antvis/g6) 是一个图可视化引擎。它提供了图的绘制、布局、分析、交互、动画等图可视化的基础能力。旨在让关系变得透明，简单。让用户获得关系数据的 Insight。基于 G6，用户可以快速搭建自己的 **图分析** 或 **图编辑** 应用。