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Update README.md

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Original file line number	Diff line number	Diff line change
`@@ -29,6 +29,7 @@ console.log(tree)`
`29`	`29`	`// we can setup listeners`
`30`	`30`	`constdestroyRoot=listen(tree, (root)=>console.log('root', root))`
`31`	`31`	`// on initial setup prints the full tree 👉 root { a: { b: { c: 1, d: 1 } } }`
	`32`	`+// the return value is a function which destroys the listener`
`32`	`33`	`constdestroyA=listen(tree.a, (a)=>console.log('a', a))`
`33`	`34`	`// 👉 a { b: { c: 1 } }`
`34`	`35`	`constdestroyB=listen(tree.a.b, (b)=>console.log('b', b))`

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