Add change note

tamasvajk · tamasvajk · commit efb876192f4b · 2022-02-28T14:58:59.000+01:00
diff --git a/csharp/ql/src/change-notes/2022-02-28-useless-upcast.md b/csharp/ql/src/change-notes/2022-02-28-useless-upcast.md
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+---
+category: minorAnalysis
+---
+* Casts to `dynamic` are excluded from the useless upcasts check (`cs/useless-upcast`).

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 +---
 +category: minorAnalysis
 +---
 +* Casts to `dynamic` are excluded from the useless upcasts check (`cs/useless-upcast`).