Plugin Updating

Can someone help me out. I found an old plugin I used to use and this code needs updated with the current pocketmine.

<?php

namespace UltraHardCore\Commands;

use UltraHardCore\Main;

use pocketmine\command\Command;
use pocketmine\command\CommandSender;
use pocketmine\command\PluginIdentifiableCommand;

class BaseCommand extends Command implements PluginIdentifiableCommand
{
private $plugin;
public function __construct(Main $plugin, $name, $description, $usageMessage, $aliases)
{
parent::__construct($name, $description, $usageMessage, $aliases);
$this->plugin = $plugin;
}
public function execute(CommandSender $sender, $commandLabel, array $args)
{
if ($this->testPermission($sender)) {
$result = $this->onExecute($sender, $args);
if (is_string($result)) {
$sender->sendMessage($result);
}
return true;
}
return false;
}
public function onExecute(CommandSender $sender, array $args)
{
}
public function getPlugin()
{
return $this->plugin;
}
}

 

is that legit all the plugin..?