4.1.0

Added

• New advanced/reversed(byMonths:) and advanced/reversed(byYears:) for GregorianDay
• New startOfMonth(timeZone:) and startOfYear(timeZone:) functions on GregorianDay
• Added more tests to ensure some of the newer functionality continues to work in the future

Changed

• Properties of GregorianDay and GregorianTimeOfDay are now variable & the types conform to Withable

Fixed

• Fixed conversion of TimeInterval into Duration for fractional seconds
• Fixed a build error when using delay(by:) due to ambiguity caused by an overload