C#: Added change note for return value attributes.

michaelnebel · michaelnebel · commit 860ded280614 · 2022-02-02T09:59:09.000+01:00
diff --git a/csharp/ql/lib/change-notes/2021-02-02-return-value-attributes.md b/csharp/ql/lib/change-notes/2021-02-02-return-value-attributes.md
@@ -0,0 +1,5 @@
+---
+category: majorAnalysis
+---
+* Return value attributes are extracted.
+* The QL `Attribute` class now has subclasses for each kind of attribute.
