Proposal: error type

[Marsup]

Hi,

I'd like to simplify some of my checks on async errors, so an API like that would help :
asyncTask((err, value) => expect(err).to.be.an.error('with that message'))

Thoughts ?

[cjihrig]

I'd take a PR for it. I think it should match throws() as much as possible.

[lock]

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