chore(package): update ts-node to version 8.5.0

Closes #16

Author: greenkeeper[bot]

package.json

@@ -49,7 +49,7 @@
     "prettier": "^1.13.3",
     "proptest": "0.0.4",
     "source-map-support": "^0.5.6",
-    "ts-node": "^6.0.5",
+    "ts-node": "^8.5.0",
     "tslint": "^5.10.0",
     "typescript": "^2.9.1"
   },