Update README.rst with changelog.

README.rst

@@ -78,7 +78,8 @@ in development
 
 * Drop Python 3.7 and support Python 3.13.
 * Trigger a warning when several docstrings are detected for the same object.
-* Improve typing.
+* Improve typing of docutils related code.
+* Run unit tests on all supported combinations of Python versions and platforms, including PyPy for Windows. Previously, tests where ran on all supported Python version for Linux, but not for MacOS and Windows.
 * Replace the deprecated dependency appdirs with platformdirs.
 * Fix WinError caused by the failure of the symlink creation process.
   Pydoctor should now run on windows without the need to be administrator.