Type for definitions["product_Base"] variants is incorrect

It seems that the type for [definitions["product_Base"].variants](https://github.com/Space48/bigcommerce-api-js/blob/master/lib/internal/reference/generated/catalog.v3.d.ts#L2464) is incorrect. 
The definition is an object (productVariant_Full) but the API responds with an array of (productVariant_Full) objects. 
