Bump jwt dependency
Bump jwt dependency

Apparently version 1.5.3 was removed upstream and was no longer
available.

Resolves #9.

coffeejunk/CredentialRegistry,CredentialEngine/CredentialRegistry,CredentialEngine/CredentialRegistry,learningtapestry/learningregistry,learningtapestry/learningregistry,CredentialEngine/CredentialRegistry,coffeejunk/CredentialRegistry,learningtapestry/learningregistry,coffeejunk/CredentialRegistry