Bump typescript version

Author: root

package.json

@@ -19,7 +19,7 @@
     "nodemon": "1.18.9",
     "npm-run-all": "4.1.5",
     "ts-node": "4.1.0",
-    "typescript": "2.9.2"
+    "typescript": "3.3"
   },
   "dependencies": {
     "apollo-errors": "1.9.0",