Add client_id to requests?

[case]

Hey John,

This is Eric from Domainr, just wondering if you'd mind adding a client_id query param to your library's requests? e.g. client_id=factor_lib.

(we're doing some prep work for adding API keys to Domainr's API later this year)

Thanks,
-Eric

[mrjbq7]

Fixed in 399ab07.