Update README.md

Author: Jimmey-Jiang

README.md

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-[![Travis branch](https://travis-ci.org/dotnetcore/DotnetSpider.svg?branch=master)](https://travis-ci.org/dotnetcore/DotnetSpider)
-[![NuGet](https://img.shields.io/nuget/v/DotnetSpider2.Extension.svg)](https://www.nuget.org/packages/DotnetSpider2.Extension)
-[![Member project of .NET China Foundation](https://img.shields.io/badge/member_project_of-.NET_CHINA-red.svg?style=flat&colorB=9E20C8)](https://github.com/dotnetcore)
-[![GitHub license](https://img.shields.io/aur/license/yaourt.svg)](https://raw.githubusercontent.com/dotnetcore/DotnetSpider/master/LICENSE)
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 ![20171011.png](http://upload-images.jianshu.io/upload_images/6855212-fd64cd5f294f1967.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
 
 ## 比较全面的c#帮助类