- SteemAuth dependency added

- steem.broadcast added with new method "vote"
- Readme updated

package.json

 {
   "name": "steem",
-  "version": "0.3.8",
+  "version": "0.3.9",
   "description": "Steem.js the JavaScript API for Steem blockchain",
   "main": "index.js",
   "scripts": {