[swift-evolution] [SR-933] Rename flatten to flattened

[Arsen Gasparyan]

Hey guys,

The 'flatten()' method didn't get the Swift 3 API renaming treatment it
should have, to go along with reversed, sorted, joined, etc.
As I see Dmitri Gribenko already agree with it but we still have to discuss
it here. So what do you think?

Implementation: https://github.com/apple/swift/pull/2038

Cheers,
Arsen
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