chore: Update README.md (#2758)

* Update README.md

Update readme to reflect NGO targets the 22.3(LTS) as well

* Update README.md

Author: chrispope

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 2020.3(LTS), 2021.3(LTS), and 2022.2
+- Unity 2021.3(LTS), and 2022.3(LTS)
 
 On the following runtime platforms:
 - Windows, MacOS, and Linux