data-interval-0.6.0: CHANGELOG.markdown

0.6.0
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* add hulls, intersections :: (Num r, Ord r) => [Interval r] -> Interval r
* fix a bug of (<=?) operator

0.5.0
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* fix dependency issue with QuickCheck and test-framework-quickcheck2

0.4.0
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* add simplestRationalWithin :: RealFrac r => Interval r -> Maybe Rational