message: add required key (and remove console log error)
diff: @@ -77,7 +77,7 @@ export const GraphLayers: React.SFC<GraphLayersProps> = props => {
  ];
  const toggleItems = visibilityLayers.map((item: VisibilityLayersType) => (
  - <div id={item.id}>
  + <div id={item.id} key={item.id}>
  <label>
  <input name="isGoing" type="checkbox" checked={item.value} onChange={() => item.onChange()} />
  {item.labelText}
  