chore(package): update lint-staged to version 9.4.2

Closes #90

Author: greenkeeper[bot]

package.json

@@ -40,7 +40,7 @@
     "fixturez": "^1.1.0",
     "husky": "^1.2.0",
     "jest": "^23.6.0",
-    "lint-staged": "^8.1.0",
+    "lint-staged": "^9.4.2",
     "xo": "^0.23.0"
   },
   "jest": {