v4.0.1 include time_limit

* Support time limit on creating question sets
* Don't break backwards compatibility by requiring an object on
question set create

Author: John Backus

package.json

@@ -16,7 +16,7 @@
     "watchlist scanning",
     "watchlists"
   ],
-  "version": "4.0.0",
+  "version": "4.0.1",
   "homepage": "https://github.com/blockscore/blockscore-node",
   "repository": {
     "type": "git",