Update dependency graphql-resolver-codegen to ^0.3.0

Author: renovate[bot]

package-lock.json

@@ -71,7 +71,7 @@
     "@types/node": "^9.3.0",
     "@types/supertest": "^2.0.4",
     "graphql-cli": "^2.16.7",
-    "graphql-resolver-codegen": "^0.1.6",
+    "graphql-resolver-codegen": "^0.3.0",
     "jest": "^21.2.1",
     "nodemon": "^1.14.1",
     "npm-run-all": "^4.1.3",