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

Author: greenkeeper[bot]

package.json

@@ -68,7 +68,7 @@
     "eslint-plugin-prettier": "^2.1.1",
     "husky": "^0.14.0",
     "is-async-supported": "^1.2.0",
-    "lint-staged": "^5.0.0",
+    "lint-staged": "^6.0.0",
     "portfinder": "^1.0.10",
     "prettier": "^1.3.1",
     "prettier-markdown": "^0.1.6",