Update for 1.6.3

By: Dinnerbone <dinnerbone@dinnerbone.com>

paper-server/src/main/java/org/bukkit/craftbukkit/CraftServer.java

@@ -59,7 +59,7 @@ import org.bukkit.util.config.Configuration;
 public final class CraftServer implements Server {
     private final String serverName = "Craftbukkit";
     private final String serverVersion;
-    private final String protocolVersion = "1.6.2";
+    private final String protocolVersion = "1.6.3";
     private final PluginManager pluginManager = new SimplePluginManager(this);
     private final ServicesManager servicesManager = new SimpleServicesManager();
     private final BukkitScheduler scheduler =  new CraftScheduler(this);