vis-timeline/dist/vis-timeline-graph2d.min -- npm build

[pLavrenov]

Overview

vis-timeline not have this file: vis-timeline/dist/vis-timeline-graph2d.min

change index.js to:
[remove] require('vis/dist/vis-timeline-graph2d.min.css');
[update] var _visTimelineGraph2d = require('vis/dist/vis-timeline-graph2d.min');

and remove "vis-timeline" from dependencies