Update README.md

Author: magefan

README.md

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 ## Features
   * Allow to load images on your store only when customer can see them. Module reduces page size and number of request.
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+<a href="https://magefan.com/magento-2-image-lazy-load-extension"><img width="300" height="60" src="https://cm.magefan.com/mf_webp/png/media/wysiwyg/DOWNLOAD_NOW.webp"></a>
 
 ## Compatibility
   * [Magento 2 WebP Optimized Images Extension](https://magefan.com/magento-2-webp-optimized-images)