JavaScript: Add change note.

Max Schaefer · Max Schaefer · commit b62be049ec8c · 2019-05-20T10:56:37.000+01:00
diff --git a/change-notes/1.21/extractor-javascript.md b/change-notes/1.21/extractor-javascript.md
@@ -4,4 +4,6 @@
 
 ## Changes to code extraction
 
+* ECMAScript 2019 support is now enabled by default.
+
 * YAML files are now extracted by default on LGTM. You can specify exclusion filters in your `lgtm.yml` file to override this behavior.
