Update changelog

Author: bmagyar

CHANGELOG.rst

@@ -2,6 +2,22 @@
 Changelog for package realtime_tools
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
+Forthcoming
+-----------
+* Fix ref for scheduled build (`#248 <https://github.com/ros-controls/realtime_tools/issues/248>`_)
+* Add realtime priority inheritance mutexes (`#197 <https://github.com/ros-controls/realtime_tools/issues/197>`_)
+* Deprecate RealtimeClock class (`#244 <https://github.com/ros-controls/realtime_tools/issues/244>`_)
+* Remove wrong comments (`#240 <https://github.com/ros-controls/realtime_tools/issues/240>`_)
+* Add `get_thread` method to `RealtimePublisher` (`#228 <https://github.com/ros-controls/realtime_tools/issues/228>`_)
+* sleep after starting thread to fix flaky tests (`#235 <https://github.com/ros-controls/realtime_tools/issues/235>`_)
+* Fix the badges in the readme (`#234 <https://github.com/ros-controls/realtime_tools/issues/234>`_)
+* First step towards modernizing the rt publisher (`#210 <https://github.com/ros-controls/realtime_tools/issues/210>`_)
+* Add missing change to .hpp for realtime_clock (`#227 <https://github.com/ros-controls/realtime_tools/issues/227>`_)
+* Remove duplicate downstream build workflow (`#230 <https://github.com/ros-controls/realtime_tools/issues/230>`_)
+* Changes after branching humble (`#217 <https://github.com/ros-controls/realtime_tools/issues/217>`_)
+* CI downstream build (`#214 <https://github.com/ros-controls/realtime_tools/issues/214>`_)
+* Contributors: Christoph Fröhlich, Lennart Nachtigall, Patrick Roncagliolo, Sai Kishor Kothakota
+
 3.0.0 (2024-12-03)
 ------------------
 * remove unused state\_ field (`#215 <https://github.com/ros-controls/realtime_tools/issues/215>`_)