Update README.md

Author: binarywang

README.md

@@ -1,7 +1,7 @@
 Weixin Java Tools 微信公众号/企业号开发Java SDK
 =====================================
 [![Maven Central](https://maven-badges.herokuapp.com/maven-central/com.github.binarywang/weixin-java-parent/badge.svg)](https://maven-badges.herokuapp.com/maven-central/com.github.binarywang/weixin-java-parent)
-[![Build Status](https://travis-ci.org/wechat-group/weixin-java-tools.svg?branch=develop)](https://travis-ci.org/wechat-group/weixin-java-tools)
+[![Build Status](https://travis-ci.org/Wechat-Group/weixin-java-tools.svg?branch=develop)](https://travis-ci.org/Wechat-Group/weixin-java-tools)
 
 ### 注意：
 1. ***本项目Fork自chanjarster/weixin-java-tools，但由于原项目已停止维护，故单独维护和发布，且发布到maven上的groupId也会不同，详细信息见下文。***