fix(package): update bluebird to version 3.7.0

Closes #195

Author: greenkeeper[bot]

package.json

@@ -35,7 +35,7 @@
     "@ethereum-alarm-clock/lib": "0.3.4",
     "@ethereum-alarm-clock/timenode-core": "7.0.0",
     "bignumber.js": "8.0.2",
-    "bluebird": "3.5.3",
+    "bluebird": "3.7.0",
     "clear": "0.1.0",
     "cli-table2": "0.2.0",
     "commander": "2.19.0",