require package.json into index.js and geo_assets.js:

- to show package version onto exported object in a low-cost,
  seemless way.

Author: etpinard

src/assets/geo_assets.js

@@ -9,4 +9,7 @@
 
 var saneTopojson = require('sane-topojson');
 
+// export the version found in the package.json
+exports.version = require('../../package.json').version;
+
 exports.topojson = saneTopojson;

src/index.js

@@ -16,6 +16,9 @@
 
 var Plotly = require('./plotly');
 
+// export the version found in the package.json
+exports.version = require('../package.json').version;
+
 // plot api
 exports.plot = Plotly.plot;
 exports.newPlot = Plotly.newPlot;