Add latest post revision date to Genesis post info.

functions.php

<?php //remove this line

add_filter( 'genesis_post_info', 'cd_post_info_filter' );
function cd_post_info_filter( $post_info ) {

	if ( ! is_singular( 'post' ) ) {

		$post_info = '[post_date] by [post_author_posts_link] [post_comments]';
		$post_modified_info = '[post_modified_date before="<br />Last updated "]';
		return $post_info . $post_modified_info;
	}
}