fix changelog

docs/changelog.md

@@ -5,6 +5,7 @@ This file lists changes for UPU only (since UP 1.02.31).
 All applicable changes are also present in the corresponding [RPU releases](https://github.com/BGforgeNet/Fallout2_Restoration_Project/blob/master/docs/changelog.md).
 Sometimes UPU or RPU may be updated independently, which is why you might see gaps in version numbers.
 
+- [Version 27](#version-27)
 - [Version 26](#version-26)
 - [Version 25](#version-25)
 - [Version 24](#version-24)
@@ -31,7 +32,7 @@ Sometimes UPU or RPU may be updated independently, which is why you might see ga
   - [Changelog](up-changelog.txt)
   - [Readme](up-readme.txt)
 
-### Version next
+### Version 27
 - General
   `FadeBackgroundMusic` sfall option is now disabled by default due to multiple issues with it.
   - [Cassidy's head](https://github.com/BGforgeNet/Fallout2_Cassidy_Head) is no longer silent by default.