chore(package): update lint-staged to version 4.0.0

Author: greenkeeper[bot]

package.json

@@ -59,7 +59,7 @@
         "webpack-dev-middleware": "^1.0.0",
         "webpack-hot-middleware": "^2.0.0",
         "husky": "^0.13.0",
-        "lint-staged": "^3.6.0",
+        "lint-staged": "^4.0.0",
         "prettier": "^1.4.2"
     },
     "peerDependencies": {