chore(deps): update dependency @types/node to v8.9.4

Author: renovate-bot

package.json

@@ -12,7 +12,7 @@
   },
   "devDependencies": {
     "@types/aws-lambda": "0.0.23",
-    "@types/node": "8.5.2",
+    "@types/node": "8.9.4",
     "ava": "0.23.0",
     "husky": "0.14.3",
     "lint-staged": "6.0.0",

yarn.lock

@@ -48,9 +48,9 @@
   version "0.0.23"
   resolved "https://registry.yarnpkg.com/@types/aws-lambda/-/aws-lambda-0.0.23.tgz#a45476fe1847eeae7cc7676a790c47acb49cfd3b"
 
-"@types/node@8.5.2":
-  version "8.5.2"
-  resolved "https://registry.yarnpkg.com/@types/node/-/node-8.5.2.tgz#83b8103fa9a2c2e83d78f701a9aa7c9539739aa5"
+"@types/node@8.9.4":
+  version "8.9.4"
+  resolved "https://registry.yarnpkg.com/@types/node/-/node-8.9.4.tgz#dfd327582a06c114eb6e0441fa3d6fab35edad48"
 
 abbrev@1:
   version "1.1.0"