chore(package): update rollup to version 0.38.0 (#205)

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -58,7 +58,7 @@
     "reflect-metadata": "^0.1.8",
     "remap-istanbul": "^0.8.0",
     "rimraf": "^2.5.2",
-    "rollup": "^0.37.0",
+    "rollup": "^0.38.0",
     "rxjs": "5.0.0-rc.4",
     "tslint": "^4.0.1",
     "typed-graphql": "^1.0.2",