Bump node-jws version number

Bump node-jws version number from 3.1.3 -> 3.1.4.
Version 3.1.3 has a dependency on base64url ~1.0.4 which is throwing the
NodeJS Buffer DeprecationWarning. version 3.1.4 pulls in base64url ^2.0.0
which address the issue.

Author: oconn

package.json

@@ -20,7 +20,7 @@
   },
   "dependencies": {
     "joi": "^6.10.1",
-    "jws": "^3.1.3",
+    "jws": "^3.1.4",
     "lodash.once": "^4.0.0",
     "ms": "^0.7.1",
     "xtend": "^4.0.1"