Update changelog for upcoming release

Author: Felix Exner

CHANGELOG.rst

@@ -2,6 +2,12 @@
 Changelog for package ur_description
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
+Forthcoming
+-----------
+* Fix multi-line strings in DeclareLaunchArgument ( backport of `#140 <https://github.com/UniversalRobots/Universal_Robots_ROS2_Description/issues/140>`_) (`#153 <https://github.com/UniversalRobots/Universal_Robots_ROS2_Description/issues/153>`_)
+* Fix default calibration file for UR30 (`#148 <https://github.com/UniversalRobots/Universal_Robots_ROS2_Description/issues/148>`_)
+* Contributors: Matthijs van der Burgh, Felix Exner
+
 2.1.4 (2024-04-04)
 ------------------
 * Update Graphical Documentation license to version 1.01 (`#143 <https://github.com/UniversalRobots/Universal_Robots_ROS2_Description/issues/143>`_)