Version 3.9.0: Add short year formatter and fix year of day computation

What's Changed

• Relax UNIX test + release 3.8.6 by @ChristopherRabotin in #266
• Introduce %y formatter by @gwbres in #268
• Update tabled requirement from 0.14.0 to 0.15.0 by @dependabot in #269
• Update der requirement from 0.6.1 to 0.7.8 by @dependabot in #252
• [Maybe breaking change] Fix day of year computation by @ChristopherRabotin in #273
• docs(fix): fixed reversed description of duration magnitude by @ethanmsl in #271

New Contributors

• @ethanmsl made their first contribution in #271

Full Changelog: 3.8.6...3.9.0