displaying lower case post statuses

includes/class-wp-rss-client.php

@@ -98,8 +98,8 @@ class WP_RSS_Client extends SimplePie implements WP_Client{
 
             $post_statuses  = get_post_statuses();
 
-            foreach( $post_statuses as $post_status ) {
-                echo '<option value="' . esc_attr( $post_status ) . '"' . selected( $post_status, $selected_post_status ) . '>' . esc_html( $post_status )  . '</option>';
+            foreach( $post_statuses as $key => $value ) {
+                echo '<option value="' . esc_attr( $key ) . '"' . selected( $key, $selected_post_status ) . '>' . esc_html( $key )  . '</option>';
             }
 
             ?>