Update README.md

Author: Pointifix

README.md

@@ -1,7 +1,7 @@
 # Sectorized Plugin
 Plugin of the Sectorized Server
 
-Join the server with `sectorized.ddns.net`
+Join the server with `sectorized.freeddns.org`
 
 ![image](https://user-images.githubusercontent.com/35230128/162400630-993d70ca-d594-4f32-ac4d-90d7b695e7dd.png)