chore(deps): update dependency @types/node to v9.6.51

Author: renovate-bot

package-lock.json

@@ -37,7 +37,7 @@
     "@ht2-labs/semantic-release": "1.1.87",
     "@types/lodash": "4.14.137",
     "@types/mocha": "2.2.48",
-    "@types/node": "9.6.50",
+    "@types/node": "9.6.51",
     "@types/source-map-support": "0.5.0",
     "assert": "1.5.0",
     "commitizen": "2.10.1",