Cambiar campos de login Laravel 5.1

[hhs]

Si es así, solo tienes que agregar la propiedad username al AuthController

Código PHP:

class AuthController extends Controller
{
    protected $username = 'username';
    
    /*
    |--------------------------------------------------------------------------
    | Registration & Login Controller
    |--------------------------------------------------------------------------
    |
    | This controller handles the registration of new users, as well as the
    | authentication of existing users. By default, this controller uses
    | a simple trait to add these behaviors. Why don't you explore it?
    |
    */
 
    use AuthenticatesAndRegistersUsers;