Update readme.md

Closes GH-27. Reviewed-by: Christian Murphy <christian.murphy.42@gmail.com> Reviewed-by: Titus Wormer <tituswormer@gmail.com>
syntax-tree · Jul 2, 2021 · 0d24628 · 0d24628
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@@ -47,6 +47,12 @@ Yields:
 { type: 'leaf', value: '3' }
 ```
 
+Note: this example also uses `unist-builder`, to run the example ensure both `unist-builder` and `unist-util-visit` are installed:
+
+```sh
+npm install unist-builder unist-util-visit
+```
+
 ## API
 
 This package exports the following identifiers: `visit`, `CONTINUE`, `SKIP`, and