structures-0.2: CHANGELOG.markdown

0.2
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* `Data.Vector.Map` now has asymptotics that are fully deamortized.
* `Data.Vector.Map.Ephemeral` provides a cache-oblivious lookahead array that doesn't deamortize.
  On the plus side it can be 2-4x faster than `Data.Vector.Map`.
  On the downside, using anything but the most recent version can dramaticlly affect the asymptotics of your program.

0.1
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* Repository initialized