JS: Add change note

Author: asger-semmle

change-notes/1.23/analysis-javascript.md

@@ -18,6 +18,7 @@
 | **Query**                      | **Expected impact**          | **Change**                                                                |
 |--------------------------------|------------------------------|---------------------------------------------------------------------------|
 | Client-side cross-site scripting (`js/xss`) | More results | More potential vulnerabilities involving functions that manipulate DOM attributes are now recognized. |
+| Prototype pollution (`js/prototype-pollution`) | Same results | The results are now shown on LGTM by default. |
 
 ## Changes to QL libraries