Merge pull request #180 from UDST/feature/fix-topojson

Fixed reference to TopoJSON module

src/util/GeoJSON.js

@@ -3,7 +3,7 @@
 */

import THREE from 'three';
import topojson from 'topojson';
import * as topojson from 'topojson';
import geojsonMerge from 'geojson-merge';
import earcut from 'earcut';
import extrudePolygon from './extrudePolygon';