How can i use idUser in a password_resets (laravel 5.2)

I want to use the table password_resets that I obtained with the comand php artisan make:auth, but this table use the "email" and this is not right because if my users change their email in their profile then is a problem to identify them, i want to use the "idUser" in the table "password_resets" instead of "email".

Where can i change this in the code????