comonad-4.0: CHANGELOG.markdown

4.0
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* Merged the contents of `comonad-transformers` and `comonads-fd` into this package.

3.1
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* Added `instance Comonad (Tagged s)`.

3.0.3
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* Trustworthy or Safe depending on GHC version

3.0.2
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* GHC 7.7 HEAD compatibility
* Updated build system