chore(package): update lint-staged to version 4.0.0 (#816)

Author: greenkeeper[bot]

package.json

@@ -76,7 +76,7 @@
     "husky": "^0.13.3",
     "jest": "^20.0.4",
     "json-schema": "0.2.3",
-    "lint-staged": "^3.4.0",
+    "lint-staged": "^4.0.0",
     "mock-fs": "^4.2.0",
     "p-event": "^1.0.0",
     "prettier": "^1.0.0",