v1.1.1

Throws an error when expires or notBefore are the only options and no other data is provided
"iat" is not a useful key. it's a required key that should be inserted automatically by the token generator.

Related note: On the server-side, we should be starting the clock on token expiration at this "iat" (issued at) time, not  the time that the token is received by the server. I didn't look at your pull request for the server but you might want to double-check that.