Updated changelog for release

Author: Andy Townsend

changelog.md

@@ -1,7 +1,7 @@
 # Changes made to this rendering
 This page describes changes made in these projects: [SomeoneElse-style](https://github.com/SomeoneElseOSM/SomeoneElse-style), [SomeoneElse-style-legend](https://github.com/SomeoneElseOSM/SomeoneElse-style-legend) and [openstreetmap-carto-AJT](https://github.com/SomeoneElseOSM/openstreetmap-carto-AJT), and visible [on this site](//map.atownsend.org.uk/maps/map/map.html).
 
-## As yet unreleased
+## 19/12/2024
 Added an icon for dog parks (some are unnamed).
 Handle railway turntables as circular polygons  with named railway landuse inside.
 Show a couple more historic railway features as "named historic dots".