Update lint-staged from 9.3.0 to 9.4.0

Author: dependencies-bot

package.json

@@ -26,7 +26,7 @@
     "husky": "3.0.5",
     "jest": "24.9.0",
     "lerna": "^2.3.1",
-    "lint-staged": "9.3.0",
+    "lint-staged": "9.4.0",
     "prettier-eslint-cli": "5.0.0"
   }
 }