How to extend or make custom PasswordBroker sendResetLink() method in Laravel 5.8?

Currently the logic behind Resetting Password is that user must provide valid/registered e-mail to receive password recovery e-mail.

In my case I don't want to validate if the e-mail is registered or not due to security concerns and I want to just do the check in back-end and tell user that "If he has provided registered e-mail, he should get recovery e-mail shortly".

What I've done to achieve this is edited in vendor\laravel\framework\src\Illuminate\Auth\Passwords\PasswordBroker.php sendResetLink() method from this:

 /**
     * Send a password reset link to a user.
     *
     * @param  array  $credentials
     * @return string
     */
    public function sendResetLink(array $credentials)
    {
        // First we will check to see if we found a user at the given credentials and
        // if we did not we will redirect back to this current URI with a piece of
        // "flash" data in the session to indicate to the developers the errors.
        $user = $this->getUser($credentials);

        if (is_null($user)) {
            return static::INVALID_USER;
        }

        // Once we have the reset token, we are ready to send the message out to this
        // user with a link to reset their password. We will then redirect back to
        // the current URI having nothing set in the session to indicate errors.
        $user->sendPasswordResetNotification(
            $this->tokens->create($user)
        );

        return static::RESET_LINK_SENT;
    }

to this:

 /**
     * Send a password reset link to a user.
     *
     * @param  array  $credentials
     * @return string
     */
    public function sendResetLink(array $credentials)
    {
        // First we will check to see if we found a user at the given credentials and
        // if we did not we will redirect back to this current URI with a piece of
        // "flash" data in the session to indicate to the developers the errors.
        $user = $this->getUser($credentials);

//        if (is_null($user)) {
//            return static::INVALID_USER;
//        }

        // Once we have the reset token, we are ready to send the message out to this
        // user with a link to reset their password. We will then redirect back to
        // the current URI having nothing set in the session to indicate errors.
        if(!is_null($user)) {
            $user->sendPasswordResetNotification(
                $this->tokens->create($user)
            );
        }

        return static::RESET_LINK_SENT;
    }

This hard-coded option is not the best solution because it will disappear after update.. so I would like to know how can I extend or implement this change within the project scope within App folder to preserve this change at all times?

P.S. I've tried solution mentioned here: Laravel 5.3 Password Broker Customization but it didn't work.. also directory tree differs and I couldn't understand where to put new PasswordBroker.php file.

Thanks in advance!

via Chebli Mohamed