Update changelog for release.

Author: Andy Townsend

resources/changelog_svwd01.md

@@ -2,7 +2,7 @@
 See also the [changelog](https://github.com/SomeoneElseOSM/SomeoneElse-vector-web-display/blob/main/changelog.md) for the scripts here.
 Except as noted, all changes also apply to the [SVWD06 Android native display style](https://github.com/SomeoneElseOSM/SomeoneElse-vector-web-display/blob/main/resources/README_svwd06.md).  
 
-## As yet unreleased
+## 20/09/2025
 Added support for various wind monitoring stations, and also water quality.
 
 ## 13/09/2025

resources/changelog_svwd08.md

@@ -1,6 +1,6 @@
 # Changes made to the [SVWD08 web display style](https://github.com/SomeoneElseOSM/SomeoneElse-vector-web-display/blob/main/resources/README_svwd08.md).  
 
-## As yet unreleased
+## 20/09/2025
 Added support for various wind monitoring stations, and also water quality.
 
 ## 13/09/2025