chore(package): update ts-node to version 8.4.0

Closes #139

Author: greenkeeper[bot]

package.json

@@ -60,7 +60,7 @@
     "karma-jasmine-html-reporter": "^0.2.2",
     "protractor": "~5.4.0",
     "rxjs-compat": "^6.2.2",
-    "ts-node": "~7.0.0",
+    "ts-node": "~8.4.0",
     "tslint": "~5.11.0",
     "typescript": "~3.2.2"
   }