chore(deps): update dependency @types/node to v8.5.5 (#25)

Author: renovate[bot]

package.json

@@ -20,7 +20,7 @@
     "docs:publish": "cp ./now.json ./docs && cd docs && now --public -f && now alias && now rm --yes --safe graphql-import & cd .."
   },
   "devDependencies": {
-    "@types/node": "8.5.4",
+    "@types/node": "8.5.5",
     "ava": "0.24.0",
     "tslint": "5.8.0",
     "tslint-config-standard": "7.0.0",