fix: update license reference (#4678)

Signed-off-by: Emmanuel Ferdman <[email protected]>

README.md

@@ -4,7 +4,7 @@
 	<a href="https://bitbucket.org/GameServerManagers/linuxgsm"><img alt="GitHub Workflow Status" src="https://img.shields.io/github/actions/workflow/status/GameServerManagers/LinuxGSM/git-sync.yml?color=0052CC&logo=bitbucket&style=flat-square"></a>
 	<a href="https://linuxgsm.com/discord"><img alt="Discord" src="https://img.shields.io/discord/127498813903601664?color=5865F2&label=%20&logo=discord&logoColor=ffffff&style=flat-square"></a>
 	<a href="https://developer.valvesoftware.com/wiki/SteamCMD"><img src="https://img.shields.io/badge/SteamCMD-000000?style=flat-square&amp;logo=Steam&amp;logoColor=white" alt="SteamCMD"></a>
-	<a href="https://github.com/GameServerManagers/LinuxGSM/blob/main/LICENSE"><img src="https://img.shields.io/github/license/gameservermanagers/LinuxGSM?style=flat-square" alt="MIT License"></a>
+	<a href="https://github.com/GameServerManagers/LinuxGSM/blob/master/LICENSE.md"><img src="https://img.shields.io/github/license/gameservermanagers/LinuxGSM?style=flat-square" alt="MIT License"></a>
 </p>
 
 [LinuxGSM](https://linuxgsm.com) is the command-line tool for quick, simple deployment and management of Linux dedicated game servers.