Update dependency lint-staged to v8.1.5 (#157)

Author: renovate-bot

package.json

@@ -41,7 +41,7 @@
     "ava": "1.4.1",
     "builtins": "2.0.0",
     "husky": "1.3.1",
-    "lint-staged": "8.1.4",
+    "lint-staged": "8.1.5",
     "prettier": "1.17.0",
     "rimraf": "2.6.3",
     "rollup": "0.67.4",