Add implied semicolon.

README.md

@@ -163,7 +163,7 @@ Leaf nodes are represented as objects with the following properties:
 The `length` property may be used to distinguish leaf nodes from internal nodes: it is undefined for leaf nodes, and 4 for internal nodes. For example, to iterate over all data in a leaf node:
 
 ```js
-if (!node.length) do console.log(node.data); while (node = node.next)
+if (!node.length) do console.log(node.data); while (node = node.next);
 ```
 
 The point’s *x*- and *y*-coordinates **must not be modified** while the point is in the quadtree. To update a point’s position, [remove](#quadtree_remove) the point and then re-[add](#quadtree_add) it to the quadtree at the new position. Alternatively, you may discard the existing quadtree entirely and create a new one from scratch; this may be more efficient if many of the points have moved.