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

Closes #24

Author: greenkeeper[bot]

package.json

@@ -58,7 +58,7 @@
     "rewire": "4.0.1",
     "source-map-support": "0.5.12",
     "superagent-mock": "3.7.0",
-    "ts-node": "8.3.0",
+    "ts-node": "8.4.1",
     "tslint": "5.18.0",
     "tslint-config-prettier": "1.18.0",
     "typescript": "3.5.3"