Swift: Add change note.

geoffw0 · geoffw0 · commit 1638796173c3 · 2023-11-24T15:41:49.000Z
diff --git a/swift/ql/lib/change-notes/2023-11-24-set.md b/swift/ql/lib/change-notes/2023-11-24-set.md
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+---
+category: minorAnalysis
+---
+* Expanded and improved flow models for `Set` and `Sequence`.

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 +---
 +category: minorAnalysis
 +---
 +* Expanded and improved flow models for `Set` and `Sequence`.