URL query parameters?

hi, i thought i might take a look at this for mastodon.el and/or fedi.el.

i'm a little surprised that plz doesn't have a params arg taking an alist of form data parameters, which is how i'm set up with my http layers.

whats the usual way to send them with plz? i'm not thinking of alists in :body for POST requests, but GET requests that take them in the URL itself, i.e. `?q=xyz`.

i can't see any mention of this in the readme, nor examples covering it. probably because it's too obvious.