Indicate 1.21.20 support

Signed-off-by: Joshua Castle <26531652+Kas-tle@users.noreply.github.com>

Author: Kas-tle

README.md

@@ -14,7 +14,7 @@ The ultimate goal of this project is to allow Minecraft: Bedrock Edition users t
 
 Special thanks to the DragonProxy project for being a trailblazer in protocol translation and for all the team members who have joined us here!
 
-### Currently supporting Minecraft Bedrock 1.20.80 - 1.21.3 and Minecraft Java 1.21
+### Currently supporting Minecraft Bedrock 1.20.80 - 1.21.20 and Minecraft Java 1.21
 
 ## Setting Up
 Take a look [here](https://wiki.geysermc.org/geyser/setup/) for how to set up Geyser.