1.1.0
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* remove unnecessary Num constraint from bunch of constructors and operations:
  `interval`, `(<=..<=)`, `(<..<=)`, `(<=..<)`, `(<..<)`, `whole`, `empty`,
  `singleton`, `intersection`, `intersections`, `hull`, `hulls`.
  Thanks to Tad Doxsee for pointing out that.

1.0.0
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* use extended-reals package for representing endpoints
* add (experimental) comparison operators that produce witnesses:
  `(<??)`, `(<=??)`, `(==??)`, `(>=??)`, `(>??)`

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`