Update dependency

Author: fritz-c

package.json

@@ -49,7 +49,7 @@
     "babel-plugin-transform-object-rest-spread": "^6.8.0",
     "babel-preset-es2015": "^6.9.0",
     "babel-preset-react": "^6.11.1",
-    "cross-env": "^2.0.0",
+    "cross-env": "^3.0.0",
     "css-loader": "0.x.x",
     "eslint": "^3.2.2",
     "eslint-config-blue-hour": "0.x.x",