chore(package): update ts-node to version 8.4.1

Closes #66

Author: greenkeeper[bot]

demo/package.json

@@ -72,7 +72,7 @@
     "protractor": "~5.3.2",
     "reflect-metadata": "^0.1.13",
     "ts-loader": "^5.3.3",
-    "ts-node": "^7.0.1",
+    "ts-node": "^8.4.1",
     "tslint": "~5.11.0",
     "typescript": "~3.2.4",
     "webpack-node-externals": "~1.7.2"