fix: move ts-node from dev-dep to dep

Regression introduced in 19f5bce

closes #455

Author: jasonkuhrt

packages/graphqlgen/package.json

@@ -52,6 +52,7 @@
     "prettier": "1.16.4",
     "reason": "3.3.4",
     "rimraf": "2.6.3",
+    "ts-node": "8.0.2",
     "typescript": "3.3.3",
     "yargs": "12.0.5"
   },
@@ -71,7 +72,6 @@
     "graphql-tag": "2.10.1",
     "jest": "23.6.0",
     "ts-jest": "23.10.5",
-    "ts-node": "8.0.2",
     "tslint": "5.12.1"
   }
 }