Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure the issue has not already been raised

Issue

There's a breaking change in fast-jwt v3.0.0 which changes the contract for users passing a callback to fast-jwt's key property on createVerifier and createSigner functions.
Since we're not using the options directly and just passing the user's supplied options we don't need to do any code changes but I think we should release a new major version when updating the package to warn users of the change in the contract. The specific change here is the key property on both sign and verify options and should be updated as shown here