Update Changelog for 2.5.1

Release 2.5.0

Update Changelog for 2.4.1

Update Changelog for 2.4.0

Fix #103 createFromRfcString forced uppercase

Fix #104 remove microseconds from date input

Update Changelog for release 2.3.0

Run tests on pull requests too

Fix #90 Support for DateTimeImmutable

Release 2.2.0