update changelog

Author: sbillinge

CHANGELOG.rst

@@ -4,6 +4,56 @@ Release notes
 
 .. current developments
 
+0.3.0
+=====
+
+**Added:**
+
+* Functionalities to estimate mu*D theoretically.
+* Added published reference to ``README.rst``.
+* Fast calculation supports values up to muD = 7
+* Recookiecut with updated ``scikit-package`` to enable docs preview in PRs.
+* Updated package standards to scikit-package 0.3.0.
+* Added ``cookiecutter.json`` file for the ``package update`` command.
+* Functionality to read wavelength and anode type directly from a diffpy configuration file.
+* Utility and example documentation for ``tools`` module.
+* Gooey support so that the app can be run with GUI
+* Coverage report in each PR
+* doi in Readme for papers.
+* Support for independent variables other than two-theta.
+* new subcommand ``applymud`` to run the original absorption correction process through CLI.
+* Utility and example documentation for the main module.
+* Added documentation for new CLI updates.
+* Documentation for functions module.
+* Spelling check via Codespell in pre-commit
+* Python 3.13 support
+* Functionality in `load_user_info` to enable user to enter an ORCID.
+
+**Changed:**
+
+* Default to brute-force computation when muD < 0.5 or > 7.
+* Print a warning message instead of error, explicitly stating the input muD value
+* Functions that use DiffractionObject` in `diffpy.utils` to follow the new API.
+* Workflow for loading wavelength - raise an error when both wavelength and anode type are specified.
+* Readme: muD now requires the ``--mud`` flag instead of a required argument.
+* Made muD an optional argument and provided different options (manually entry / z-scan file path) for users to specify muD
+* Increased the number of significant figures for wavelength and separated values for Ka1 and Ka2.
+* hyphens / underscores format according to new scikit-package group standard.
+* GitHub workflows for renamed test file.
+* Return a ``ValueError`` if no wavelength is found on config file or if its not specified.
+* Compartmentalize commands into the subcommands ``mud``, ``zscan``, and ``sample``. See documentation for more info.
+* Changed ``doc`` to ``docs`` and ``CODE_OF_CONDUCT.rst`` to ``CODE-OF-CONDUCT.rst`` to comply with scikit-package standards.
+* All function docstrings and tests to be more informative, incorporating new ORCID function and improving overall clarity.
+
+**Fixed:**
+
+* duplicated wavelength information in output files
+
+**Removed:**
+
+* Remove the import of extend_path from pkgutil in diffpy/__init__.py since we are not strictly following the Python namespace package convention.
+
+
 0.2.0
 =====