fix(package): update d3-node to version 2.1.0

Closes #22

Author: greenkeeper[bot]

package.json

@@ -38,7 +38,7 @@
     "clui": "^0.3.6",
     "colors": "^1.1.2",
     "cross-env": "^5.1.3",
-    "d3-node": "^1.1.3",
+    "d3-node": "^2.1.0",
     "debug": "^3.1.0",
     "fast-csv": "^2.4.1",
     "fs-extra": "^6.0.1",