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

Author: greenkeeper[bot]

package.json

@@ -52,7 +52,7 @@
     "in-publish": "^2.0.0",
     "jest": "^21.1.0",
     "licensor": "^4.0.0",
-    "lint-staged": "^5.0.0",
+    "lint-staged": "^6.0.0",
     "prettier": "^1.8.2",
     "webpack": "^3.5.6"
   },