Update README.md

Author: slight

README.md

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 # 网易云音乐 API
 
+[![Latest Stable Version](https://poser.pugx.org/kilingzhang/netease-cloud-music-api/v/stable)](https://packagist.org/packages/kilingzhang/netease-cloud-music-api)
 [![Latest Unstable Version](https://poser.pugx.org/kilingzhang/netease-cloud-music-api/v/unstable)](https://packagist.org/packages/kilingzhang/netease-cloud-music-api)
 [![License](https://poser.pugx.org/kilingzhang/netease-cloud-music-api/license)](https://packagist.org/packages/kilingzhang/netease-cloud-music-api)
 ## 描述