remove utctz method and normalize_timezone. utctz is too tiny to be a senseful wrapper and normalize_tiezone did a bit too much (allowing tzinfo instances, where never one could be passed)
remove utctz method and normalize_timezone. utctz is too tiny to be a senseful wrapper and normalize_tiezone did a bit too much (allowing tzinfo instances, where never one could be passed)

untitaker/icalendar,nylas/icalendar,geier/icalendar