chore(package): update @types/node to version 9.4.4

Closes #21

Author: greenkeeper[bot]

package.json

@@ -70,7 +70,7 @@
     "@compodoc/compodoc": "^1.0.0-beta.9",
     "@types/jasmine": "^2.5.47",
     "@types/karma": "^0.13.35",
-    "@types/node": "^8.0.13",
+    "@types/node": "^9.4.4",
     "@types/webpack": "^3.0.4",
     "@types/webpack-env": "^1.13.0",
     "angular2-template-loader": "^0.6.2",