fix typo in readme

Author: JulienMalige

README.md

@@ -83,7 +83,7 @@ class MyComponent extends React.Component {
 | Property                      | Type                   | Options                                                                       | Required? | Default                                                       | Description                                                                                                                                                                                                                                                                                                                                                                                                                   |
 |:------------------------------|:-----------------------|:------------------------------------------------------------------------------|:----------|:--------------------------------------------------------------|:------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
 | `data`                        | `array`                |                                                                               | required  | `undefined`                                                   | Single-element array containing hierarchical object (see `myTreeData` above). <br /> Contains (at least) `name` and `parent` keys.                                                                                                                                                                                                                                                                                            |
-| `nodeSvgShape`                | `object`               | see [Node shapes](#node-shapes)                                               |           | `{shape: 'circle', shapeProps: r: 10}`                        | Sets a specific SVG shape element + shapeProps to be used for each node.                                                                                                                                                                                                                                                                                                                                                      |
+| `nodeSvgShape`                | `object`               | see [Node shapes](#node-shapes)                                               |           | `{shape: 'circle', shapeProps: {r: 10}}`                        | Sets a specific SVG shape element + shapeProps to be used for each node.                                                                                                                                                                                                                                                                                                                                                      |
 | `nodeLabelComponent`          | `object`               | see [Using foreignObjects](#using-foreignobjects)                             |           | `null`                                                        | Allows using a React component as a node label; requires `allowForeignObjects` to be set.                                                                                                                                                                                                                                                                                                                                     |
 | `onClick`                     | `func`                 |                                                                               |           | `undefined`                                                   | Callback function to be called when a node is clicked. <br /><br />Has the function signature `(nodeData, evt)`. The clicked node's data object is passed as first parameter, event object as second.                                                                                                                                                                                                                         |
 | `onMouseOver`                 | `func`                 |                                                                               |           | `undefined`                                                   | Callback function to be called when mouse enters the space belonging to a node. <br /><br />Has the function signature `(nodeData, evt)`. The clicked node's data object is passed as first parameter, event object as second.                                                                                                                                                                                                |