chore(package): update ts-node to version 8.9.0

Closes #110

Author: greenkeeper[bot]

package.json

@@ -75,7 +75,7 @@
     "sinon": "^6.0.1",
     "source-map-support": "^0.5.6",
     "ts-loader": "^6.1.0",
-    "ts-node": "^7.0.1",
+    "ts-node": "^8.9.0",
     "tslint": "^5.10.0",
     "tslint-config-standard": "^8.0.0",
     "typedoc": "^0.15.0",