Custom JWT validations

[karlismelderis]

Maybe it's already possible with current setup and I'm just reading README wrong 🤷‍♂️

Describe the problem you'd like to have solved

Cognito JWT tokens have property:

'cognito:groups': [ ... list of groups ...],

I would like to write extra validation function (instead of another middle-ware) to specify if user is member of group then ...

Describe the ideal solution

jwt({
validation: (decodedToken) => {
... so some validation and throw if needed ...
})

## Alternatives and current work-arounds

I would need to attach new middleware to validate decoded `.user`