chore(package): update @types/node to version 9.3.0

Closes #51

Author: greenkeeper[bot]

package.json

@@ -16,7 +16,7 @@
     "@types/ansi-styles": "^2.0.30",
     "@types/jest": "22.0.1",
     "@types/nock": "9.1.1",
-    "@types/node": "8.5.7",
+    "@types/node": "9.3.0",
     "cli-ux": "^2.0.21",
     "del-cli": "1.1.0",
     "http-call": "^4.0.8",