chore(package): update lint-staged to version 7.1.0

Closes #14

Author: greenkeeper[bot]

package.json

@@ -36,7 +36,7 @@
   },
   "devDependencies": {
     "husky": "^0.14.0",
-    "lint-staged": "^4.2.1",
+    "lint-staged": "^7.1.0",
     "mocha": "^4.0.0",
     "prettier-standard": "^6.0.0",
     "semantic-release": "^7.0.1",