Futures 0.2 has been yanked

[Igor Gnatenko]

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Hey,

Recently upstream of "futures" crate yanked all 0.2 releases and pushed
them as "futures-preview". I wonder what we should do in regard to this…

Also there is no way to get automatic notifications whether upstream has
yanked something, we probably want to build some automation in anitya.

Thoughts?
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-Igor Gnatenko