Merge pull request #17 from zephraph/greenkeeper/@types/node-9.3.0

Update @types/node to the latest version 🚀

Author: zephraph

package.json

@@ -48,7 +48,7 @@
   ],
   "devDependencies": {
     "@types/jest": "^22.0.0",
-    "@types/node": "^8.0.0",
+    "@types/node": "^9.3.0",
     "husky": "^0.14.0",
     "jest": "^22.0.0",
     "lint-staged": "^6.0.0",