chore(package): update lint-staged to version 6.0.0

Author: greenkeeper[bot]

package.json

@@ -51,7 +51,7 @@
     "@types/node": "^8.0.0",
     "husky": "^0.14.0",
     "jest": "^21.0.0",
-    "lint-staged": "^5.0.0",
+    "lint-staged": "^6.0.0",
     "np": "^2.14.1",
     "ts-jest": "^21.0.0",
     "tslint": "^5.2.0",