Update README.md

Author: magefan

README.md

@@ -183,3 +183,4 @@ The code is licensed under [Open Software License ("OSL") v. 3.0](http://opensou
   * [Shopify Blog](https://apps.shopify.com/magefan-blog)
   * [Shopify Size Chart](https://magefan.com/shopify/apps/size-chart)
   * [Shopify Google Indexer](https://magefan.com/shopify/apps/google-indexing)
+  * [Shopify Product Feeds](https://magefan.com/shopify/apps/product-feed)