Fix typo in History.md

* '3.0.0 / 2013-12-19' is shown twice.
Merge pull request #63 from tricknotes/fix-history.md

Fix typo in History.md
mispell in code comment
Merge pull request #64 from narqo/master

Mispell in code comment
bug: nil arguments replaced with error fn
Merge pull request #67 from logicalparadox/bug/nil

bug: nil argument in first position replaced with error fn
3.0.2
readme: remove references to join
removed co.join() from all examples
Merge pull request #70 from armed/master

Replaced co.join() from all examples with []