Added factory and seeder for sub-bookings.

database/factories/BookingFactory.php

@@ -1,12 +1,16 @@
 <?php
 
 use Faker\Generator as Faker;
+use Carbon\Carbon;
 
 $factory->define(App\Booking::class, function (Faker $faker) {
     return [
         'date'=> $faker->dateTimeBetween('2014-01-01'),
         'reference' => $faker->text(50),
         'person_or_company' => $faker->name,
-        'note' => $faker->text(10)
+        'note' => $faker->text(10),
+
+        'created_at' => Carbon::now()->format('Y-m-d H:i:s'),
+        'updated_at' => Carbon::now()->format('Y-m-d H:i:s')
     ];
 });