Missing contributor on Chapter 19

[GAConsultancy]

Could you please add Mr. Saverio Gini from MemEx Srl as contributor of chapter 19?
Thanks
Regards,
Giorgio Ambrosino

[aszasz]

For the record, Giorgio first reached out via email and kindly brought the issue here again to experiment with the GitHub interface per my request (Thank you Giorgio), in his email he mentioned that

you can see from the our past exchange of emails Saverio has collaborated with Brendan, Christoff Krogskeepers, Pratik Dave and me to this chapter. "

@thaiscmlima, this is pretty reasonable and straightforward to me, but I would like your explicit consent before making the change. Please authorize.