Update README.md

Author: huan

README.md

@@ -3,7 +3,7 @@
 ![Java CI with Maven](https://github.com/wechaty/java-wechaty/workflows/Java%20CI%20with%20Maven/badge.svg)
 [![Java Version](https://img.shields.io/maven-central/v/io.github.wechaty/wechaty?label=Maven)](https://mvnrepository.com/artifact/io.github.wechaty/wechaty)
 
-![Java Wechaty](https://wechaty.github.io/java-wechaty/images/java-wechaty.png)
+![Java Wechaty](docs/images/java-wechaty.png)
 
 [![Java Wechaty Getting Started](https://img.shields.io/badge/Java%20Wechaty-Getting%20Started-orange)](https://github.com/wechaty/java-wechaty-getting-started)
 [![Wechaty in Kotlin](https://img.shields.io/badge/Wechaty-Kotlin-orange)](https://github.com/wechaty/java-wechaty)