Add superagent

[john-pettigrew]

Added a library for really easy HTTP test assertions.

[sindresorhus]

Thanks, but I'm gonna pass on this. I've used SuperTest before and it's API is just too magic. .expect() is way too overloaded and it makes it really hard to read the assertions. There are better HTTP assertion libs on npm.

[ewnd9]

@sindresorhus A part of your reasoning for declining #608:

I've used SuperTest before and it's API is just too magic. .expect() is way too overloaded and it makes it really hard to read the assertions

But supertest is still valuable just for wrapping an http server and sending requests.

E.g. there is the "Endpoint testing" recipe in ava docs which includes supertest but uses ava assertions.

Maybe it might still be added with a note about avoiding the built-in assertions?

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Edit: whoops, I intended to post this in the newer issue