add change note

Author: erik-krogh

javascript/ql/lib/change-notes/2022-04-04-dataflow-models.md

@@ -0,0 +1,5 @@
+---
+category: minorAnalysis
+---
+* Many library models have been rewritten to use dataflow nodes instead of the AST.
+  These changes include some renamings where the old name is still available as a deprecated feature.