update

Updating Readme to reflect the version of Unity support by NGO v2

Author: NoelStephensUnity

README.md

@@ -24,7 +24,7 @@ For general questions, networking advice or discussions about Netcode for GameOb
 ### Compatibility
 
 Netcode for GameObjects targets the following Unity versions:
-- Unity 2021.3(LTS), and 2022.3(LTS)
+- Unity 6 (LTS)
 
 On the following runtime platforms:
 - Windows, MacOS, and Linux