chore(package): update @types/node to version 9.4.7

Closes #61

Author: greenkeeper[bot]

package.json

@@ -80,7 +80,7 @@
     "@angular/platform-browser": "^4.1.3",
     "@angular/platform-browser-dynamic": "^4.1.3",
     "@types/jasmine": "2.5.53",
-    "@types/node": "^8.0.0",
+    "@types/node": "^9.4.7",
     "camelcase": "^4.0.0",
     "codecov": "^2.2.0",
     "codelyzer": "^3.0.1",