fix: typings dependency for Node

Author: citizensas

package.json

@@ -14,6 +14,7 @@
     "workfront-api-constants": "2.0.0"
   },
   "dependencies": {
+    "@types/node": "8.0.24",
     "es6-promise": "4.1.1",
     "form-data": "2.2.0",
     "isomorphic-fetch": "2.2.1",
@@ -23,7 +24,6 @@
   "devDependencies": {
     "@types/form-data": "2.2.0",
     "@types/mocha": "2.2.42",
-    "@types/node": "8.0.24",
     "@types/should": "11.2.0",
     "codecov": "2.3.0",
     "dateformat": "2.0.0",