Update CHANGELOG

CHANGELOG

@@ -3,6 +3,17 @@ changelog
 
 Current Release:    raylib 5.0 (18 November 2023)
 
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+Release:     raylib 5.5 - 11th Anniversary Edition? (18 November 2024?)
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+KEY CHANGES:
+ -
+ -
+ -
+
+Detailed changes:
+...
+
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 Release:     raylib 5.0 - 10th Anniversary Edition (18 November 2023)
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