allow restricting joining queues to certain protocol versions

platforms/velocity/src/main/java/us/ajg0702/queue/platforms/velocity/VelocityMethods.java

@@ -2,6 +2,7 @@ package us.ajg0702.queue.platforms.velocity;
 
 import com.google.common.io.ByteArrayDataOutput;
 import com.google.common.io.ByteStreams;
+import com.velocitypowered.api.network.ProtocolVersion;
 import com.velocitypowered.api.plugin.PluginContainer;
 import com.velocitypowered.api.proxy.Player;
 import com.velocitypowered.api.proxy.ProxyServer;
@@ -147,4 +148,9 @@ public class VelocityMethods implements PlatformMethods {
 
         return result;
     }
+
+    @Override
+    public String getProtocolName(int protocol) {
+        return ProtocolVersion.getProtocolVersion(protocol).getMostRecentSupportedVersion();
+    }
 }