chore(package): update lint-staged to version 6.1.1

Closes #48

Author: greenkeeper[bot]

package.json

@@ -17,7 +17,7 @@
     "concat-stream": "^1.6.0",
     "cz-conventional-changelog": "^2.0.0",
     "husky": "^0.14.3",
-    "lint-staged": "^5.0.0",
+    "lint-staged": "^6.1.1",
     "prettier": "^1.7.4",
     "standard-version": "^4.3.0",
     "tap": "10.7.1"