Prepare `0.4.1` release notes

Merge pull request hwi#923 from stloyd/feature/changelog

Log missing changes, update readme & composer files

Update notes for release 0.3.9

Update more notes for release 0.3.8

Backport changes from `0.4` version

Add missing CHANGELOG note for 0.3.6 version

[ci skip]

Prepare release 0.3.5

Prepare release 0.3.4

Prepare release 0.3.3

Adding createdAt property to serialization

The createdAt property was not serialized so the isExpired() method was not working as intended.