ISO Week Date Toolkit

The `iso-week-date` library provides a toolkit for working with ISO Week date formats, specifically YYYY-WNN and YYYY-WNN-D. It offers `IsoWeek` and `IsoWeekDate` classes to manage these date formats, facilitating parsing, conversion, and operations directly, thus avoiding common pitfalls associated with converting between string, `date`, and `datetime` objects in Python. The current version is 2.3.0, and it maintains a regular release cadence as needed for updates and new features.