chore(package): update babel-preset-stage-2 to version 6.16.0

https://greenkeeper.io/

package.json

@@ -200,7 +200,7 @@
     "babel-plugin-transform-object-rest-spread": "6.16.0",
     "babel-preset-es2015": "6.14.0",
     "babel-preset-react": "6.11.1",
-    "babel-preset-stage-2": "6.13.0",
+    "babel-preset-stage-2": "6.16.0",
     "babel-register": "6.14.0",
     "bundle-loader": "0.5.4",
     "chai": "3.5.0",