Updated wp-includes/class-wp-feed-cache.php for FeedWordPress

$ diff wp-includes/class-wp-feed-cache.php.org wp-includes/class-wp-feed-cache.php
25c25
< class WP_Feed_Cache extends SimplePie_Cache {
---
> class WP_Feed_Cache {  //class WP_Feed_Cache extends SimplePie_Cache {
37c37
< 	public function create( $location, $filename, $extension ) {
---
> 	public static function create( $location, $filename, $extension ) {   //public function create( $location, $filename, $extension ) {

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