Fix up the seeder command

app/Console/Commands/DemoSeederCommand.php

@@ -44,6 +44,8 @@ class DemoSeederCommand extends Command
 
     /**
      * Execute the console command.
+     *
+     * @return void
      */
     public function fire()
     {

database/seeds/DatabaseSeeder.php

@@ -0,0 +1,25 @@
+<?php
+
+/*
+ * This file is part of Cachet.
+ *
+ * (c) Alt Three Services Limited
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+use Illuminate\Database\Seeder;
+
+class DatabaseSeeder extends Seeder
+{
+    /**
+     * Run the database seeding.
+     *
+     * @return void
+     */
+    public function run()
+    {
+        //
+    }
+}