C#: Add change note

hvitved · hvitved · commit 70b9b002cb6a · 2021-10-04T10:48:07.000+02:00
diff --git a/csharp/change-notes/2021-10-04-dead-store-of-local.md b/csharp/change-notes/2021-10-04-dead-store-of-local.md
@@ -0,0 +1,2 @@
+lgtm,codescanning
+* Discarded `using` declarationg, `using var _ = ...`, are no longer flagged by the query "Useless assignment to local variable".

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	`+lgtm,codescanning`
	`2`	+* Discarded `using` declarationg, `using var _ = ...`, are no longer flagged by the query "Useless assignment to local variable".