Update Bukkit for 1.3.1 changes

By: feildmaster <admin@feildmaster.com>

paper-api/src/main/java/org/bukkit/command/Command.java

@@ -47,6 +47,22 @@ public abstract class Command {
      */
     public abstract boolean execute(CommandSender sender, String commandLabel, String[] args);
 
+    /**
+     * Executed on tab completion for this command, returning a list of options
+     * the player can tab through.
+     * <p />
+     * By returning null, you tell Bukkit to generate a list of players to send
+     * to the sender.
+     * By returning an empty list, no options will be sent.
+     *
+     * @param sender Source object which is executing this command
+     * @param args All arguments passed to the command, split via ' '
+     * @return null to generate a Player list, otherwise a list of options
+     */
+    public List<String> tabComplete(CommandSender sender, String[] args) {
+        return null;
+    }
+
     /**
      * Returns the name of this command
      *
@@ -110,7 +126,7 @@ public abstract class Command {
         if ((permission == null) || (permission.length() == 0)) {
             return true;
         }
-        
+
         for (String p : permission.split(";")) {
             if (target.hasPermission(p)) {
                 return true;