Update README.md

Author: serucee

README.md

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 # Wirecard Checkout Seamless plugin for WooCommerce
 
 [![License](https://img.shields.io/badge/license-GPLv2-blue.svg)](https://raw.githubusercontent.com/wirecard/woocommerce-wcs/master/LICENSE)
-[![WooCommerce](https://img.shields.io/badge/WooCommerce-v3.4.4-green.svg)](https://woocommerce.com/)
+[![WooCommerce](https://img.shields.io/badge/WooCommerce-v3.5.1-green.svg)](https://woocommerce.com/)
 [![WordPress](https://img.shields.io/badge/WordPress-v4.9-green.svg)](https://wordpress.org/)
 [![PHP v5.6](https://img.shields.io/badge/php-v5.6-yellow.svg)](http://www.php.net)
 [![PHP v7.0](https://img.shields.io/badge/php-v7.0-yellow.svg)](http://www.php.net)