Adding a changelog entry

doc/source/changelog.rst

@@ -68,6 +68,13 @@ organisation on `GitHub <https://github.com/openbiosim/sire>`__.
   correct AtomIdx, rather than added as the last atoms in the molecule. This
   is also more natural. This fixes issue #202.
 
+* Added the "center" keyword argument to the ``make_whole`` functions of
+  :class:`~sire.mol.Cursors`, :class:`~sire.mol.CursorsM` and
+  :class:`~sire.system.System` (as well as to the legacy System class).
+  Also allowed the constructor of :class:`~sire.maths.Vector` to recognise
+  ``origin`` and ``zero`` as arguments, meaning you can write
+  ``cursor.make_whole(center="origin")``. This fixes issue #199.
+
 * Please add an item to this changelog when you create your PR
 
 `2024.1.0 <https://github.com/openbiosim/sire/compare/2023.5.2...2024.1.0>`__ - April 2024