2015.0.1 (2015-05)
==================

*  Fix documentation to reflect addition of 2015 leap second.
*  Hide hypothetical leap seconds (prior to 1972-01-01).
*  Add test suite to .cabal.

2015 (2015-01)
==============

*  Added 2015 leap second (2015-06-30T23:59:60Z).

2012 (2012-01)
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*  Added 2012 leap second (2012-06-30T23:59:60Z).

2009 (2009-01)
==============

Initial release including all leap seconds up to 2009-01-01.