Add substr-rw to WANTED

paultcochrane · paultcochrane · commit c61d3c7da2b1 · 2015-06-08T23:46:01.000+02:00
diff --git a/WANTED b/WANTED
@@ -19,3 +19,6 @@ Synatax features:
 
 API docs:
     * KeyReducer
+
+Builtins:
+    * substr-rw
