Update repository base code to be cleaner and make use of PHP 7 features

app/Contracts/Repository/ScheduleRepositoryInterface.php

@@ -1,11 +1,4 @@
 <?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\Contracts\Repository;
 
@@ -38,5 +31,5 @@ interface ScheduleRepositoryInterface extends RepositoryInterface
      * @param string $timestamp
      * @return \Illuminate\Support\Collection
      */
-    public function getSchedulesToProcess($timestamp);
+    public function getSchedulesToProcess(string $timestamp): Collection;
 }