Use big integers to match Laravel

[Jamesking56]

Laravel's default now uses bigInteger and bigIncrements where needed for integer ID values in the database. As you can see here Laravel uses $table->id() in the default users table migration which in the latest version of Laravel uses bigIncrements:

https://github.com/laravel/framework/blob/e1db317e7dafa8867b0eada6f89393419ed84cb0/src/Illuminate/Database/Schema/Blueprint.php#L744