time-1.6: changelog.md

# Change Log

## [1.6]

### Added
- FormatTime, ParseTime, Show and Read instances for UniversalTime
- diffTimeToPicoseconds
- this change log

### Changed
- Use clock_gettime where available
- Read and Show instances exported in the same module as their types
- Fixed bug in fromSundayStartWeekValid
- Parsing functions now reject invalid dates
- Various documentation fixes

## [1.5.0.1]