update readme

Readme.md

@@ -2,26 +2,11 @@
 [![Build Status](https://travis-ci.org/fartherp/javaxml.svg?branch=master)](https://travis-ci.org/fartherp/javaxml)
 [![Coverage Status](https://coveralls.io/repos/github/fartherp/javaxml/badge.svg?branch=master)](https://coveralls.io/github/fartherp/javaxml?branch=master)
 [![Maven Central](https://maven-badges.herokuapp.com/maven-central/com.github.fartherp/javaxml/badge.svg)](https://maven-badges.herokuapp.com/maven-central/com.github.fartherp/javaxml/)
+[![Sonatype Nexus (Snapshots)](https://img.shields.io/nexus/s/https/oss.sonatype.org/com.github.fartherp/javaxml.svg)](https://oss.sonatype.org/content/repositories/snapshots/com/github/fartherp/javaxml)
 [![GitHub release](https://img.shields.io/github/release/fartherp/javaxml.svg)](https://github.com/fartherp/javaxml/releases)
 [![License](https://img.shields.io/badge/license-Apache%202-4EB1BA.svg)](https://www.apache.org/licenses/LICENSE-2.0.html)
 [![Project Stats](https://www.openhub.net/p/javaxml/widgets/project_thin_badge.gif)](https://www.openhub.net/p/javaxml)
 
-## 如何使用？
-1. 在项目中加入```javaxml```依赖
-
-    ```Maven```
-    ``` xml
-    <dependency>
-        <groupId>com.github.fartherp</groupId>
-        <artifactId>javaxml</artifactId>
-        <version>2.0.2</version>
-    </dependency>
-    ```
-    ```Gradle```
-    ```
-    compile 'com.github.fartherp:javaxml:2.0.2'
-    ```
-
 ## Document
 java公用信息
 ### Sample Code