Make https://github.com/stuartpb a Collaborator to this repo

[cirosantilli]

I've recently wanted to ping someone for Collaborator consensus, and the first person that came to mind besides Isaacs was @stuartpb

I propose we make him a collab, he has made useful comments countless times already.

cc/ @isaacs

[stuartpb]

👍 I actually had an email sitting in my Drafts I started writing in April or May proposing @cirosantilli and I be added as collaborators on this repo.