chore(package): update lint-staged to version 8.1.4

Closes #21

Author: greenkeeper[bot]

package.json

@@ -30,7 +30,7 @@
     "eslint-config-prettier": "^2.9.0",
     "husky": "^0.14.3",
     "jest": "^22.0.4",
-    "lint-staged": "^7.0.0",
+    "lint-staged": "^8.1.4",
     "remove-lockfiles": "^2.0.4",
     "xo": "^0.20.3"
   },