representable-functors-3.1: CHANGELOG.markdown

3.1
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* Required Distributive as a superclass
* Renamed `Data.Functor.Corepresentable` to `Data.Functor.Contravariant.Representable` to finally clean up this long-standing abuse of terminology.

3.0.1
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* Removed intra-package dependencies
* Added `README.markdown`
* Added IRC build-bot notification