Clojurians Log v2

I was looking at an api that uses the newish java CompletableFuture stuff, and thinking what a bummer it would be to have to write all the adapter bits between that and core.async, then I realized you could (if you ignored all good practices about extending protocols you don't own to types you don't own) just extend core.async's protocols to the completeable future interfaces. https://gist.github.com/hiredman/1788aa052f26d127c00a1679656026f0