HikaShop AcyMailing Plugin not picking up variants

-- HikaShop version -- : 2.6.3
-- Joomla version -- : 3.5.1

Hi, Nicolas & Team -

Recently while implementing AcyMailing email marketing for one of our clients, we discovered that the "HikaShop Customers who bought..." filter wasn't picking up any customers who bought product variants. Only standard products were being picked up by the filter.

Therefore we modified the AcyMailing plugin code to include variants when filtering for product purchases. It would be great if you would enhance the plugin with our updated code in your version going forward. The revised code provides a more accurate filtering of all HikaShop purchases, plus we'd like to help our client avoid maintaining custom code for the AcyMailing plugin when upgrading.