docs: Fix readme wording

Author: fritz-c

README.md

@@ -36,7 +36,7 @@ export default class Tree extends Component {
 ```
 Find more examples in the [Storybook](https://fritz-c.github.io/react-sortable-tree/storybook/)
 
-Play with an [example on WebpackBin](https://www.webpackbin.com/bins/-KudqEIsooxEdVHV4G8c)
+Play with the code on an [example on WebpackBin](https://www.webpackbin.com/bins/-KudqEIsooxEdVHV4G8c)
 
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