Update README.md

Author: chanjarster

README.md

@@ -43,6 +43,6 @@ weixin-java-tools
 
 ## 升级指南
 
-[1.0.3升级指南](https://github.com/chanjarster/weixin-java-tools/wiki/1_0_3升级指南)
-[1.1.0升级指南](https://github.com/chanjarster/weixin-java-tools/wiki/1_1_0升级指南)
-[1.1.1升级指南](https://github.com/chanjarster/weixin-java-tools/wiki/1_1_1升级指南)
+* [1.0.3升级指南](https://github.com/chanjarster/weixin-java-tools/wiki/1_0_3升级指南)
+* [1.1.0升级指南](https://github.com/chanjarster/weixin-java-tools/wiki/1_1_0升级指南)
+* [1.1.1升级指南](https://github.com/chanjarster/weixin-java-tools/wiki/1_1_1升级指南)