Add more changes to the change log

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CHANGELOG.md

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 ## 0.2
 
+- Undate and UndateInterval now include an optional label for named dates or time periods
 - Support partially known dates with missing digits (e.g. 1991-1?-10)
 - Rich comparison checks for Undate
   - improved equality check; now supports comparing Undate object with day precision to datetime.date
   - implementations and tests for comparison, sorting and contains (`>`, `<`, `>=`, `<=`, and `in`)
 - static method to initialize an Undate object from a datetime.date (used for comparisons)
 - Example Jupyter notebook comparing Undate duration calculation against
   dates and durations in the [Shakespeare and Company Project](https://shakespeareandco.princeton.edu/) [events dataset](https://doi.org/10.34770/nz90-ym25)
+- Preliminary support for parsing Extended Date Time Format (EDTF) level 0 and some of level 1 and transforming into Undate objects
 - Dropped support for python 3.8; added python 3.12
 - Python type improvements and preliminary type checking with mypy