Version 1.89.9 (fixed changelog header)

docs/CHANGELOG.txt

@@ -37,9 +37,11 @@ HOW TO UPDATE?
 
 
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- VERSION 1.89.9 WIP (In Progress)
+ VERSION 1.89.9 (Released 2023-09-04)
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+Decorated log and release notes: https://github.com/ocornut/imgui/releases/tag/v1.89.9
+
 Breaking changes:
 
 - Clipper: Renamed IncludeRangeByIndices(), also called ForceDisplayRangeByIndices()