message: change Dagre layout to be horizontal
diff: @@ -3,7 +3,8 @@ import { GraphType } from './GraphType';
  export class DagreGraph implements GraphType {
  static getLayout() {
  return {
  - name: 'dagre'
  + name: 'dagre',
  + rankDir: 'LR'
  };
  }
  }
  