chore(package): update @types/node to version 9.6.6

Closes #11

Author: greenkeeper[bot]

package.json

@@ -12,7 +12,7 @@
   },
   "devDependencies": {
     "@types/got": "^7.1.3",
-    "@types/node": "^8.0.26",
+    "@types/node": "^9.6.6",
     "@types/query-string": "^5.0.0",
     "ts-node": "^3.3.0",
     "typescript": "^2.5.2"