修改介绍

README.md

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 # Nepxion Discovery 框架架构
 [![Total lines](https://tokei.rs/b1/github/Nepxion/Discovery?category=lines)](https://tokei.rs/b1/github/Nepxion/Discovery?category=lines)  [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg?label=license)](https://github.com/Nepxion/Discovery/blob/master/LICENSE)  [![Maven Central](https://img.shields.io/maven-central/v/com.nepxion/discovery.svg?label=maven%20central)](http://search.maven.org/#search%7Cga%7C1%7Cg%3A%22com.nepxion%22%20AND%20discovery)  [![Javadocs](http://www.javadoc.io/badge/com.nepxion/discovery-plugin-framework.svg)](http://www.javadoc.io/doc/com.nepxion/discovery-plugin-framework)  [![Build Status](https://travis-ci.org/Nepxion/Discovery.svg?branch=master)](https://travis-ci.org/Nepxion/Discovery)  [![Codacy Badge](https://api.codacy.com/project/badge/Grade/8e39a24e1be740c58b83fb81763ba317)](https://www.codacy.com/project/HaojunRen/Discovery/dashboard?utm_source=github.com&utm_medium=referral&utm_content=Nepxion/Discovery&utm_campaign=Badge_Grade_Dashboard)
 
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 - [Nepxion Discovery【探索】微服务企业级解决方案(PDF版)](http://nepxion.gitee.io/docs/link-doc/discovery-solution-pdf.html)
 - [Nepxion Discovery【探索】架构篇(PDF版)](http://nepxion.gitee.io/docs/link-doc/discovery-framework-pdf.html) 或 [Nepxion Discovery【探索】架构篇(HTML版)](http://nepxion.gitee.io/docs/link-doc/discovery-framework.html)