JS: add 1.20 change note

Author: asger-semmle

change-notes/1.20/analysis-javascript.md

@@ -0,0 +1,24 @@
+# Improvements to JavaScript analysis
+
+## General improvements
+
+* TODO
+
+## New queries
+
+| **Query**                                     | **Tags**                                             | **Purpose**                                                                                                                                                                 |
+|-----------------------------------------------|------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
+| Useless comparison test | correctness | Highlight code that is unreachable due to a numeric comparison that is always true or alway false. |
+
+
+## Changes to existing queries
+
+| **Query**                      | **Expected impact**        | **Change**                                   |
+|--------------------------------|----------------------------|----------------------------------------------|
+| todo | | |
+
+
+## Changes to QL libraries
+
+* TODO
+