Bump bluebird to 3.0.5

package.json

@@ -56,7 +56,7 @@
   },
   "dependencies": {
     "binary-search": "^1.2.0",
-    "bluebird": "^2.9.12",
+    "bluebird": "^3.0.5",
     "body-parser": "^1.12.0",
     "chalk": "^1.0.0",
     "cheerio": "^0.19.0",