chore(package): update bencode to version 0.9.0

http://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -20,7 +20,7 @@
     "url": "https://github.com/feross/bittorrent-tracker/issues"
   },
   "dependencies": {
-    "bencode": "^0.8.0",
+    "bencode": "^0.9.0",
     "bn.js": "^4.4.0",
     "compact2string": "^1.2.0",
     "debug": "^2.0.0",