0.7 05oct2017
* fixed bug in header logic
* added append_datestamp option to datestamp the file

0.6 16jun2015
* added version and logging

0.5 10may2015
* ok to return values during catchup

0.4 02may2015
* fix header logic

0.3 02may2015
* use 'mode' instead of append
* ensure header option is boolean

0.2 02may2015
* added the append option
* fix some typos

0.1 02may2015
* initial public release
