Add token algorithm encryption configuration support

[marwins]

Hey @robsontenorio, nice library :).

Here's a pull request to add jwt token encryption configuration, it would be great if it could be part of the next release.

Let me know if you need me to do any change.

Thank you.

[robsontenorio]

Thanks !

Could you please add a test to check if it decodes the token using the proper algorithm?

[marwins]

@robsontenorio I added a test