message: feat(example): remove handler
diff: import React, { PureComponent } from 'react';
  -import Graph, { isEdge } from '../src';
  +import Graph, { isEdge, isNode } from '../src';
  // import Graph from '../dist/ReactGraph';
  const SpecialNode = ({ data, onChange, styles }) => (
  @@ -98,12 +98,26 @@ class App extends PureComponent {
  this.graphInstance.zoomOut();
  }
  + onElementsRemove(elements) {
  + const nodeIds = elements.filter(isNode).map(n => n.id);
  +
  + this.setState(prevState => ({
  + elements: prevState.elements.filter(e => {
  + return (
  + !nodeIds.includes(e.id) &&
  + !nodeIds.includes(e.target) &&
  + !nodeIds.includes(e.source)
  + );
  + })
  + }));
  + }
  +
  render() {
  return (
  <Graph
  elements={this.state.elements}
  onElementClick={node => console.log('clicked', node)}
  - onElementsRemove={elements => console.log('remove', elements)}
  + onElementsRemove={elements => this.onElementsRemove(elements)}
  style={{ width: '100%', height: '100%' }}
  onLoad={graphInstance => this.onLoad(graphInstance)}
  onChange={(elements) => this.onChange(elements)}
  