[site-reviews] change the notification emails

/**
 * Add the reviewer's email to the list of emails that the
 * Site Reviews notification is sent to when a new review is created.
 *
 * @param array $emails
 * @param \GeminiLabs\SiteReviews\Review $review
 * @return array
 */
add_filter('site-reviews/notification/emails', function ($emails, $review) {
    $emails[] = $review->email;
    return $emails;
}, 10, 2);