Add change note

Author: hvitved

ruby/ql/lib/change-notes/2022-12-14-constructor-flow.md

@@ -0,0 +1,14 @@
+---
+ category: majorAnalysis
+---
+ * Flow through `initialize` constructors is now taken into account. For example, in
+ ```rb
+class C
+  def initialize(x)
+    @field = x
+  end
+end
+
+C.new(y)
+```
+there will be flow from `y` to the field `@field` on the constructed `C` object.