JavaScript: Add change note.

Max Schaefer · Max Schaefer · commit 335adee69ce8 · 2018-10-03T16:03:12.000+01:00
diff --git a/change-notes/1.19/analysis-javascript.md b/change-notes/1.19/analysis-javascript.md
@@ -30,3 +30,5 @@
 | Server-side URL redirect | More results | This rule now recognizes redirection calls in more cases. |
 
 ## Changes to QL libraries
+
+* The flow configuration framework now supports distinguishing and tracking different kinds of taint, specified by an extensible class `FlowLabel` (which can also be referred to by its alias `TaintKind`).
