update Packagist

Author: zhangchunsheng

README.md

@@ -3,7 +3,7 @@
 [![Packagist PHP Version Support](https://img.shields.io/packagist/php-v/wechaty/php-wechaty)](https://packagist.org/packages/wechaty/php-wechaty)
 [![PHP](https://github.com/wechaty/php-wechaty/workflows/PHP/badge.svg)](https://github.com/wechaty/php-wechaty/actions?query=workflow%3APHP)
 
-![PHP Wechaty](https://wechaty.github.io/php-wechaty/images/php-wechaty.png)
+[![PHP Wechaty](https://wechaty.github.io/php-wechaty/images/php-wechaty.png)](https://github.com/wechaty/php-wechaty)
 
 [![PHP Wechaty Getting Started](https://img.shields.io/badge/PHP%20Wechaty-Getting%20Started-7de)](https://github.com/wechaty/php-wechaty-getting-started)
 [![Wechaty in PHP](https://img.shields.io/badge/Wechaty-PHP-7de)](https://github.com/wechaty/php-wechaty)