Update README.md

Author: magefan

README.md

@@ -105,6 +105,7 @@ http://software77.net/geo-ip/
   * [Magento 2 YouTube Widget Extension](https://magefan.com/magento2-youtube-extension)
   * [Magento 2 CLI Extension](https://magefan.com/magento2-cli-extension)
   * [Magento 2 Facebook Pixel Extension](https://magefan.com/magento-2-facebook-pixel-extension)
+  * [Magento 2 Price History](https://magefan.com/magento-2-price-history)
 
 ### [Magento 2 Blog Extensions](https://magefan.com/magento-2-extensions/blog-extensions)