Added link to EU VAT Assistant

The [EU VAT Assistant](https://wordpress.org/plugins/woocommerce-eu-vat-assistant/) is a free, premium plugin that includes all the features needed to achieve compliance with the new EU VAT rules. [A paid version is also available](http://aelia.co/shop/eu-vat-assistant-woocommerce/) and it includes access to premium support.
Merge pull request #10 from aelia-co/gh-pages

Added link to EU VAT Assistant