* Fixed bug that was killing performance for medium sized files. The module is now 10x faster than previous versions. Reported by John Yeung.
0.2.2
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* Added worksheet data validation options. See the :func:`data_validation` method, :ref:`working_with_data_validation` and :ref:`ex_data_valid`.
* There are now over 600 unit tests including more than 130 tests that compare against the output of Excel.
0.2.1
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* Added support for datetime.datetime, datetime.date and datetime.time to the :func:`write_datetime` method. :issue:`3`. Thanks to Eduardo (eazb) and Josh English for the prompt.
0.2.0
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* Added conditional formatting. See the :func:`conditional_format` method, :ref:`working_with_conditional_formats` and :ref:`ex_cond_format`.
0.1.9
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* Added Python 2.6 support. All tests now pass in the following versions: