Merge pull request #552 from syuilo/greenkeeper/@types/node-7.0.31

Update @types/node to the latest version 🚀

package.json

@@ -52,7 +52,7 @@
     "@types/morgan": "1.7.32",
     "@types/ms": "0.7.29",
     "@types/multer": "0.0.34",
-    "@types/node": "7.0.29",
+    "@types/node": "7.0.31",
     "@types/ratelimiter": "2.1.28",
     "@types/redis": "2.6.0",
     "@types/request": "0.0.43",