Merge pull request kubernetes-client#562 from DocX/patch-1

Add prepack script to package scripts

Author: k8s-ci-robot

package.json

@@ -26,6 +26,7 @@
     "watch": "tsc --watch",
     "test": "nyc mocha",
     "prepare": "npm run build",
+    "prepack": "npm run build",
     "docs": "typedoc src/gen/api"
   },
   "nyc": {