fix(package): update bluebird to version 3.5.5

Closes #25

Author: greenkeeper[bot]

package.json

@@ -61,7 +61,7 @@
     "strong-error-handler": "2.1.0"
   },
   "dependencies": {
-    "bluebird": "3.5.0",
+    "bluebird": "3.5.5",
     "debug": "2.6.8",
     "lodash": "4.17.4"
   },