fix: readme styles

Signed-off-by: Xinwei Xiong(cubxxw) <3293172751nss@gmail.com>

README.md

@@ -9,7 +9,7 @@
 <p align=center>
 <a href="https://goreportcard.com/report/github.com/OpenIMSDK/Open-IM-Server"><img src="https://goreportcard.com/badge/github.com/OpenIMSDK/Open-IM-Server" alt="A+"></a>
 <a href="https://github.com/OpenIMSDK/Open-IM-Server/issues?q=is%3Aissue+is%3Aopen+sort%3Aupdated-desc+label%3A%22good+first+issue%22"><img src="https://img.shields.io/github/issues/OpenIMSDK/Open-IM-Server/good%20first%20issue?logo=%22github%22" alt="good first"></a>
-<a href="https://github.com/OpenIMSDK/Open-IM-Server"><img src="https://img.shields.io/github/stars/AppFlowy-IO/appflowy.svg?style=flat&logo=github&colorB=deeppink&label=stars"></a>
+<a href="https://github.com/OpenIMSDK/Open-IM-Server"><img src="https://img.shields.io/github/stars/OpenIMSDK/Open-IM-Server.svg?style=flat&logo=github&colorB=deeppink&label=stars"></a>
 <a href="https://join.slack.com/t/openimsdk/shared_invite/zt-1tmoj26uf-_FDy3dowVHBiGvLk9e5Xkg"><img src="https://img.shields.io/badge/Slack-10%2B-blueviolet?logo=slack&amp;logoColor=white"></a>
 <a href="https://github.com/OpenIMSDK/Open-IM-Server/blob/main/LICENSE"><img src="https://img.shields.io/badge/license-Apache--2.0-green"></a>
 <a href="https://golang.org/"><img src="https://img.shields.io/badge/Language-Go-blue.svg"></a>