Update readme (#3)

* update README.md
diff --git a/README.md b/README.md
index c383a02..e261c9c 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-Hessian Lite(Alibaba embed version)
+## Hessian Lite(Alibaba embed version)
 
 [![Build Status](https://travis-ci.org/dubbo/hessian-lite.svg?branch=master)](https://travis-ci.org/dubbo/hessian-lite)
 [![codecov](https://codecov.io/gh/dubbo/hessian-lite/branch/master/graph/badge.svg)](https://codecov.io/gh/dubbo/hessian-lite)
@@ -6,11 +6,18 @@
 ![license](https://img.shields.io/github/license/alibaba/dubbo.svg)
 ![maven](https://img.shields.io/maven-central/v/com.alibaba/hessian-lite.svg)
 
-The newest version is
-```
- <dependency>
+Hessian-lite is a Alibaba dubbo embed version of [official hessian](https://github.com/ebourg/hessian) initially.  Then this module is separated from Dubbo. All branches of [Dubbo](https://github.com/apache/incubator-dubbo) : 2.5.x, 2.6.x(since 2.6.3) and 2.7.x  are dependent on it , please see the details:
+
+- [2018-07-13 Delete the code of dubbo/hessian-lite module of the 2.6.x and 2.5.x branches](https://lists.apache.org/thread.html/72f7bbca340e96fb7da6a7ada014312953cfccd19271fad8e60cbf39@%3Cdev.dubbo.apache.org%3E) 
+- [2018-06-04 Moving hessian-lite from Dubbo codebase to eco-system](https://lists.apache.org/thread.html/872bbcada2db0f04145f853dd7c7f8abef589807b8089a5016478ec8@%3Cdev.dubbo.apache.org%3E) 
+
+## Maven dependency
+
+```xml
+<dependency>
     <groupId>com.alibaba</groupId>
     <artifactId>hessian-lite</artifactId>
     <version>3.2.4</version>
- <dependency>
+<dependency>
 ```
+