dep: use topojson-client

- 'topojson' pkg is now meant for server-side manipulation as of v2
- 'topojson-client' includes the client-side topology to geojson
  features methods we need.

Author: etpinard

package.json

@@ -88,7 +88,7 @@
     "sane-topojson": "^2.0.0",
     "superscript-text": "^1.0.0",
     "tinycolor2": "^1.3.0",
-    "topojson": "^1.6.20",
+    "topojson-client": "^2.1.0",
     "webgl-context": "^2.2.0"
   },
   "devDependencies": {

src/lib/topojson_utils.js

@@ -11,8 +11,8 @@
 
 var topojsonUtils = module.exports = {};
 
-var locationmodeToLayer = require('../plots/geo/constants').locationmodeToLayer,
-    topojsonFeature = require('topojson').feature;
+var locationmodeToLayer = require('../plots/geo/constants').locationmodeToLayer;
+var topojsonFeature = require('topojson-client').feature;
 
 
 topojsonUtils.getTopojsonName = function(geoLayout) {

src/plots/geo/geo.js

@@ -26,7 +26,7 @@ var constants = require('./constants');
 
 var xmlnsNamespaces = require('../../constants/xmlns_namespaces');
 var topojsonUtils = require('../../lib/topojson_utils');
-var topojsonFeature = require('topojson').feature;
+var topojsonFeature = require('topojson-client').feature;
 
 // add a few projection types to d3.geo
 addProjectionsToD3(d3);