HadISD3 changelog

Version		Date		Description
3.0.0		2019-01-10	Initial release

3.1.0		2019-12-11	Conversion to Python 3, and bugfix for World Record Check.

3.2.0		2021-10-07	QC tests updated after North American Heatwave in June 2021.

3.3.0		2022-02-07	Corrected calm winds post-2013 from ISD error. Updated world record check values for temperature and dewpoint.

3.3.0		2023-01-10	Updated wet bulb temperature calculation for humidity files (no version increase as not primary variable)