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rcu-0.2.1: CHANGELOG.markdown

## 0.2.1
* Support `doctest-0.12`

## 0.2
* Revamp `Setup.hs` to use `cabal-doctest`. This makes it build
  with `Cabal-2.0`, and makes the `doctest`s work with `cabal new-build` and
  sandboxes.

## 0
* Initial version