chore(package): update bluebird to version 3.0.5

http://greenkeeper.io/
diff --git a/package.json b/package.json
index ddb50d2..03092c8 100644
--- a/package.json
+++ b/package.json
@@ -26,7 +26,7 @@
   },
   "dependencies": {
     "JSONStream": "^1.0.6",
-    "bluebird": "~2.9.24",
+    "bluebird": "~3.0.5",
     "bulkbadger": "^1.0.0",
     "config-chain": "~1.1.8",
     "couchbulkimporter": "^1.0.0",