Fix dependency issue (#75)

package.json

@@ -44,6 +44,7 @@
     "eslint-plugin-react": "5.2.2",
     "extract-text-webpack-plugin": "1.0.1",
     "file-loader": "0.9.0",
+    "fs-extra": "^0.30.0",
     "html-webpack-plugin": "2.22.0",
     "json-loader": "0.5.4",
     "opn": "4.0.2",
@@ -56,7 +57,6 @@
   },
   "devDependencies": {
     "bundle-deps": "^1.0.0",
-    "fs-extra": "^0.30.0",
     "react": "^15.2.1",
     "react-dom": "^15.2.1"
   },