lint: sub Core -> Plotly in gl2d index

Author: etpinard

lib/index-gl2d.js

@@ -8,13 +8,12 @@
 
 'use strict';
 
-var Core = require('./core');
+var Plotly = require('./core');
 
-// Load all trace modules
-Core.register([
+Plotly.register([
     require('./scattergl'),
     require('./heatmapgl'),
     require('./contourgl')
 ]);
 
-module.exports = Core;
+module.exports = Plotly;