Refactor how repositories for the daemon work.

app/Repositories/Daemon/CommandRepository.php

@@ -1,26 +1,21 @@
 <?php
-/**
- * Pterodactyl - Panel
- * Copyright (c) 2015 - 2017 Dane Everitt <dane@daneeveritt.com>.
- *
- * This software is licensed under the terms of the MIT license.
- * https://opensource.org/licenses/MIT
- */
 
 namespace Pterodactyl\Repositories\Daemon;
 
-use Webmozart\Assert\Assert;
+use Psr\Http\Message\ResponseInterface;
 use Pterodactyl\Contracts\Repository\Daemon\CommandRepositoryInterface;
 
 class CommandRepository extends BaseRepository implements CommandRepositoryInterface
 {
     /**
-     * {@inheritdoc}
+     * Send a command to a server.
+     *
+     * @param string $command
+     * @return \Psr\Http\Message\ResponseInterface
+     * @throws \Pterodactyl\Exceptions\Repository\RecordNotFoundException
      */
-    public function send($command)
+    public function send(string $command): ResponseInterface
     {
-        Assert::stringNotEmpty($command, 'First argument passed to send must be a non-empty string, received %s.');
-
         return $this->getHttpClient()->request('POST', 'server/command', [
             'json' => [
                 'command' => $command,