message: docs(example): add select to node
diff: @@ -7,14 +7,11 @@ const SpecialNode = ({ data, styles }) => (
  <div
  style={{ background: '#FFCC00', padding: 10, borderRadius: 30, ...styles }}
  >
  - I am <strong>special</strong>!<br />{data.label}
  - <input
  - style={{ margin: '10px 0' }}
  - />
  - <select>
  - <option>1</option>
  - <option>2</option>
  - <option>3</option>
  + <div>I am <strong>special</strong>!<br />{data.label}</div>
  + <select onChange={(e) => data.onChange(e.target.value, data)}>
  + <option value="1">1</option>
  + <option value="2">2</option>
  + <option value="3">3</option>
  </select>
  </div>
  );
  @@ -23,6 +20,19 @@ class App extends PureComponent {
  constructor() {
  super();
  + const onChange = (id, d) => {
  + this.setState(prevState => (
  + { elements: prevState.elements.map(e => ({
  + ...e,
  + data: {
  + ...e.data,
  + label: '6' === e.data.id ? `option ${id} selected` : e.data.label
  + }
  + }))
  + }
  + ));
  + }
  +
  this.state = {
  elements: [
  { data: { id: '1', label: 'Tests', type: 'input' }, position: { x: 50, y: 50 } },
  @@ -30,7 +40,7 @@ class App extends PureComponent {
  { data: { id: '3', label: 'This is a node' }, position: { x: 100, y: 200 }, style: { background: '#222', color: '#fff' } },
  { data: { id: '4', label: 'nody nodes', type: 'output' }, position: { x: 50, y: 300 } },
  { data: { id: '5', label: 'Another node', type: 'default' }, position: { x: 400, y: 300 } },
  - { data: { id: '6', label: 'I have inputs', type: 'special' }, position: { x: 400, y: 400 } },
  + { data: { id: '6', label: 'no option selected', type: 'special', onChange }, position: { x: 400, y: 400 } },
  { data: { source: '1', target: '2' } },
  { data: { source: '2', target: '3' } },
  { data: { source: '3', target: '4' } },
  @@ -72,6 +82,7 @@ class App extends PureComponent {
  }
  render() {
  + console.log(this.state.elements);
  return (
  <Graph
  elements={this.state.elements}
  