chore(package): update lint-staged to version 6.0.0

Author: greenkeeper[bot]

package.json

@@ -25,7 +25,7 @@
     "eslint-plugin-prettier": "^2.3.1",
     "husky": "^0.14.3",
     "jest": "^21.2.1",
-    "lint-staged": "^5.0.0",
+    "lint-staged": "^6.0.0",
     "prettier": "^1.8.1"
   },
   "prettier": {