Update change log in preparation for 3.18.3 release

CHANGELOG.rst

@@ -4,23 +4,18 @@ CHANGELOG
 This project uses `semantic versioning <http://semver.org/>`_.
 This change log uses principles from `keep a changelog <http://keepachangelog.com/>`_.
 
+
 [Unreleased]
 ------------
 
 
 Added
 ^^^^^
 
-- github CI test workflow
-- publication workflow
-- dynamic versioning
-- dtool icon
 
 Changed
 ^^^^^^^
 
-- updated badges in ``README.rst``
-- replaced ``setup.py`` with ``pyproject.toml``
 
 Deprecated
 ^^^^^^^^^^
@@ -30,6 +25,33 @@ Removed
 ^^^^^^^
 
 
+Fixed
+^^^^^
+
+
+Security
+^^^^^^^^
+
+
+[3.18.3] - 2024-06-24
+---------------------
+
+
+Added
+^^^^^
+
+- github CI test workflow
+- publication workflow
+- dynamic versioning
+- dtool icon
+
+Changed
+^^^^^^^
+
+- updated badges in ``README.rst``
+- replaced ``setup.py`` with ``pyproject.toml``
+
+
 Fixed
 ^^^^^
 
@@ -38,9 +60,6 @@ Fixed
 - Test timestamp conversion against fixed UTC time in unit tests, not local time
 - Made unit tests Python 3.12-compatible
 
-Security
-^^^^^^^^
-
 
 [3.18.2] - 2022-03-20
 ---------------------