acme-year-2024: changelog.md

# Changelog for [`acme-year` package](https://hackage.haskell.org/package/acme-year)

## 2024

* [#7](https://github.com/joeyadams/hs-acme-year/pull/7)
    * Hotfix to patch a Y2023 issue.
* Minor adjustment for better accuracy in 2024.
* Update cabal version to 1.10 for compatibility with Hackage.
* Remove `-O2`, which appears to have no impact on performance.
* Update the example year to 2024 as well.
* Add changelog.