chore(package): update babylonjs to version 4.0.2

Closes #18

Author: greenkeeper[bot]

package.json

@@ -34,7 +34,7 @@
     "babel-cli": "^6.24.1",
     "babel-preset-es2015": "^6.22.0",
     "babelify": "^7.3.0",
-    "babylonjs": "^3.1.1",
+    "babylonjs": "^4.0.2",
     "browserify": "^14.5.0",
     "enlightme": "^0.1.1",
     "expect.js": "^0.3.1",