approximate-0.2: CHANGELOG.markdown

0.2
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* Removed the `data-default` dependency
* Increased range of supported versions of `generic-deriving`.

0.1.1
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* Ported `Data.Approximate.Numerics` from [analytics](http://github.com/analytics)

0.1
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* Ported `Data.Approximate.Type` and `Data.Approximate.Mass` from [analytics](http://github.com/analytics)