amend check of options.expires

enough to check if it's an instance of `Date`

Author: YakovL

6-data-storage/01-cookie/article.md

@@ -311,7 +311,7 @@ function setCookie(name, value, options = {}) {
     ...options
   };
 
-  if (options.expires instanceof Date && options.expires.toUTCString) {
+  if (options.expires instanceof Date) {
     options.expires = options.expires.toUTCString();
   }