add bonus goal

README.md

@@ -274,6 +274,10 @@ Last year's project to add [ab] for canvas-private abstractions was a success.
 This project aims to make it possible to export such patches for compability
 with Pd Vanilla.
 
+### Bonus Goal
+Use an abstraction wrapper named `[ab]` that works in Pd Vanilla to provide
+a shim. This way the main patch could remain the same in both versions of Pd.
+
 ### Languages
 C, possibly a little bit of HTML5/Javascript to add the menu option and
 event handler.