add change-note

Author: erik-krogh

javascript/change-notes/2021-02-10-markdown.md

@@ -0,0 +1,8 @@
+lgtm,codescanning
+* The dataflow libraries now model dataflow in markdown parses.
+  Affected packages are
+    [marked](https://npmjs.com/package/marked), 
+    [markdown-table](https://npmjs.com/package/markdown-table), 
+    [showdown](https://npmjs.com/package/showdown), 
+    [unified](https://npmjs.com/package/unified), and
+    [remark](https://npmjs.com/package/remark)