v0.24.0

Full Changelog: 0.23.0...v0.24.0

• IRI parser according to rfc3987
• prefix resolution according to base when prefix is relative
• more tests
• various bugfixes

v0.22.0

Full Changelog: v0.20.0...v0.22.0

** fix missing implementation for formatting xsd:date, xsd:dateTime and xsd:time
** bump dependencies
** clippy fix