Update README.md

README.md

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 Open-IM-Server is open source instant messaging Server.Backend in Go.
 ![avatar](https://github.com/OpenIMSDK/Open-IM-Server/blob/main/docs/Open-IM.png)
 
-[![LICENSE](https://img.shields.io/github/license/pingcap/tidb.svg)](https://github.com/OpenIMSDK/open-im-server/master/LICENSE)
+[![LICENSE](https://img.shields.io/github/license/pingcap/tidb.svg)](https://github.com/OpenIMSDK/Open-IM-Server/blob/main/LICENSE)
 [![Language](https://img.shields.io/badge/Language-Go-blue.svg)](https://golang.org/)
 
 ## Open-IM-Server: Open source  Instant Messaging Server