chore(deps): update dependency @types/node to v9.4.0

Author: renovate-bot

package.json

@@ -22,7 +22,7 @@
   },
   "devDependencies": {
     "@types/graphql": "0.12.3",
-    "@types/node": "9.3.0",
+    "@types/node": "9.4.0",
     "typescript": "2.6.2"
   },
   "repository": {

yarn.lock

@@ -6,9 +6,9 @@
   version "0.12.3"
   resolved "https://registry.yarnpkg.com/@types/graphql/-/graphql-0.12.3.tgz#c429585aaa4523135e0ab4e12dec72d2d913946f"
 
-"@types/node@9.3.0":
-  version "9.3.0"
-  resolved "https://registry.yarnpkg.com/@types/node/-/node-9.3.0.tgz#3a129cda7c4e5df2409702626892cb4b96546dd5"
+"@types/node@9.4.0":
+  version "9.4.0"
+  resolved "https://registry.yarnpkg.com/@types/node/-/node-9.4.0.tgz#b85a0bcf1e1cc84eb4901b7e96966aedc6f078d1"
 
 "@types/zen-observable@0.5.3":
   version "0.5.3"