chore(package): update lint-staged to version 8.1.5

Closes #23

Author: greenkeeper[bot]

package.json

@@ -50,7 +50,7 @@
     "eslint-plugin-prettier": "^2.2.0",
     "husky": "^0.14.3",
     "jest": "^22.4.3",
-    "lint-staged": "^7.0.4",
+    "lint-staged": "^8.1.5",
     "prettier": "^1.8.1",
     "semantic-release": "^15.1.7"
   },