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

Closes #284

Author: greenkeeper[bot]

Diff for: package.json

@@ -111,7 +111,7 @@
     "shelljs": "^0.8.3",
     "travis-deploy-once": "^5.0.9",
     "ts-jest": "^23.10.2",
-    "ts-node": "^7.0.1",
+    "ts-node": "^8.4.1",
     "tslint": "^5.11.0",
     "tslint-config-prettier": "^1.15.0",
     "tslint-config-standard": "^8.0.1",