chore(package): update bcryptjs to version 2.4.0

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -18,7 +18,7 @@
   ],
   "license": "BSD-3-Clause",
   "dependencies": {
-    "bcryptjs": "2.3.0",
+    "bcryptjs": "2.4.0",
     "body-parser": "1.15.2",
     "commander": "2.9.0",
     "deepcopy": "0.6.3",