fix(package): update bluebird to version 3.5.4

Closes #34

Author: greenkeeper[bot]

package.json

@@ -69,7 +69,7 @@
     "validate-commit-msg": "2.12.2"
   },
   "dependencies": {
-    "bluebird": "3.5.0",
+    "bluebird": "3.5.4",
     "debug": "2.6.8",
     "fsm-as-promised": "0.14.4",
     "lodash": "4.17.4"