Update CHANGELOG and readthedocs config

.readthedocs.yaml

@@ -7,10 +7,10 @@ build:
   jobs:
     post_create_environment:
       - pip install poetry==1.8.2
-      - poetry config virtualenvs.create false
     post_install:
-      - poetry install --without dev
-      - poetry run python -m ipykernel install --user
+      # See https://docs.readthedocs.io/en/stable/build-customization.html#install-dependencies-with-poetry
+      - VIRTUAL_ENV=$READTHEDOCS_VIRTUALENV_PATH poetry install --without dev
+      - VIRTUAL_ENV=$READTHEDOCS_VIRTUALENV_PATH poetry run python -m ipykernel install --user
 
 sphinx:
   configuration: docs/conf.py

CHANGELOG.md

@@ -7,6 +7,12 @@ project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
 
+### Changed
+
+- All `ParamData` objects now internally track the latest time that they or any of their
+  children were last updated, which is returned by `ParamData.last_updated`.
+- `Param` and `Struct` are combined into a single class `ParamDataclass`.
+
 ## [0.11.0] (Jan 31 2024)
 
 ### Added