Fix legacy handshake with hostnames that include IP addresses (#571)

README.md

@@ -1,6 +1,6 @@
 # Velocity
 
-[![Build Status](https://img.shields.io/jenkins/s/https/ci.velocitypowered.com/job/velocity.svg)](https://ci.velocitypowered.com/job/velocity/)
+[![Build Status](https://img.shields.io/jenkins/s/https/ci.velocitypowered.com/job/velocity.svg)](https://ci.velocitypowered.com/job/velocity-3.0.0/)
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 A Minecraft server proxy with unparalleled server support, scalability,

proxy/src/main/java/com/velocitypowered/proxy/connection/backend/VelocityServerConnection.java

@@ -122,7 +122,7 @@ public class VelocityServerConnection implements MinecraftConnectionAssociation,
             .orElseGet(() -> registeredServer.getServerInfo().getAddress())
             .getHostString())
         .append('\0')
-        .append(proxyPlayer.getRemoteAddress().getHostString())
+        .append(proxyPlayer.getRemoteAddress().getAddress().getHostAddress())
         .append('\0')
         .append(proxyPlayer.getGameProfile().getUndashedId())
         .append('\0');