chore(package): update ts-node to version 8.9.1

Closes #137

Author: greenkeeper[bot]

package.json

@@ -49,7 +49,7 @@
     "protractor": "~5.2.0",
     "request": "^2.81.0",
     "request-promise": "^4.2.1",
-    "ts-node": "~4.1.0",
+    "ts-node": "~8.9.1",
     "tslint": "~5.4.3",
     "typescript": "~2.5.2"
   },