Add a Comonad instance to Control.Applicative.Free #160
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Since `Day` is a `Comonad`, and the free `Applicative` can be built out of `Day` and coproducts, `Free f` is also a`Comonad` whenever `f` itself is.
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Free fcan be built out off,Day,IdentityandCoproduct, so I thinkFree fshould be aComonadwheneverfitself is.It's unfortunately not a
ComonadTrans, since you can'tlowerin thePurecase (although the freeApplyis). I wrote a bit more about this here.