2.5.1 / 2016-10-26
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 * reverts variadic support #64, an unintended breaking change

2.5.0 / 2016-10-25
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 * add variadic support #64

2.4.0 / 2016-03-03
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 * return the latest value

2.3.0 / 2014-05-01
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 * remove instrumentation

2.2.0 / 2014-01-22
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 * add `fn._name` for debugging

2.1.0 / 2013-12-22
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 * add debugging support
 * improve performance ~15%

2.0.1 / 2013-12-21
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  * update co to v3
  * use generator delegation

2.0.0 / 2013-11-07
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  * change middleware signature expected