chore(package): update ts-node to version 8.1.1

Closes #2

Author: greenkeeper[bot]

package.json

@@ -67,7 +67,7 @@
     "protractor": "^5.3.1",
     "standard-version": "^4.3.0",
     "ts-loader": "^4.3.1",
-    "ts-node": "^6.1.0",
+    "ts-node": "^8.1.1",
     "typescript": "~2.9.1"
   },
   "description": "An Ionic project"