Get linked company info if VAT number exists

[Eazis-Music-Systems]

For some countries, like ours, the VIES data service returns linked company info. We would like to be able to retrieve that info too, if a VAT number exists.

VIES FAQ:
https://ec.europa.eu/taxation_customs/vies/faq.html#item_17

VIES Example:
https://ec.europa.eu/taxation_customs/vies/vatResponse.html
NL 809901973B01

It was requested in v1.2.1 with a PR before, but it was closed without getting into master branch.
#22

[nicolaibaaring]

I have implemented this on my fork, and could create a PR, if it's relevant.
https://github.com/nicolaibaaring/vat/tree/feature-linked-vat-result