0.2.1.0

• Fix Traversable, TraversableWithIndex, FoldableWithIndex to traverse in insertion order (#12)
• Add unorderedTraverse, unorderedTraverseWithKey, unoderedFoldMap, and unorderedFoldMapWithKey.
• union doesn't overflow the internal counter (#10)

0.2.0.0

• Use aeson-1
• removed our FromJSONKey and ToJSONKey in favour of aeson variants