update futures dependency to 0.3

[aav]

update futures dependency to 0.3

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[aav]

@googlebot I signed it!

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[darconeous]

I'm almost certain I'll accept this commit as-is, but I'd like a little clarification on one part, outlined below.

[darconeous]

This change doesn't immediately look related to the futures update. Can you elaborate?

[aav]

hm.. i was almost 100% sure, that Delay::reset has been removed from the API, at some point. I will check and if it is still there, obviously, this change does not make sense, and I will revert it.

[aav]

just pushed the commit, which reverses unneeded Delay re-creation. Although, some small change is still needed - Delay::reset chnaged it's signature.

[aav]

compilation fails due to regression in 1.42-nightly :(

rust-lang/rust#67743

[darconeous]

With this change we can build on stable now, right?

[aav]

Yes, it builds on stable