Revert "Revert "upgraded iso8601 to 0.9 (#112)""
Revert "Revert "upgraded iso8601 to 0.9 (#112)""

This reverts commit e318c8ce6c145032d83731f9ec96d83c7e4aed54.

vheuken/video_info,drakmail/video_info,thibaudgg/video_info