chore(package): update ts-node to version 8.1.1

Closes #70

Author: greenkeeper[bot]

package.json

@@ -102,7 +102,7 @@
     "semantic-release": "^15.9.17",
     "travis-deploy-once": "^5.0.9",
     "ts-loader": "^5.2.1",
-    "ts-node": "^7.0.1",
+    "ts-node": "^8.1.1",
     "tsconfig-paths": "^3.6.0",
     "tsconfig-paths-webpack-plugin": "^3.2.0",
     "tslint": "^5.11.0",