Finalizes changelog

Author: Aaron Dandy

changelog.md

@@ -2,7 +2,7 @@
 
 All notable changes to this project will be documented in this file.
 
-## 5.0.0 - Upcoming
+## 5.0.0 - 2023-12
 
 - Removes usages of `Environment.TickCount`: [PR #83](https://github.com/aarondandy/WeCantSpell.Hunspell/pull/83)
 - Adds `net8.0` as a new target