update JWT calling conventions

[v01dpointer]

The go-jwt package has breaking api changes from v2 to v3, requiring some of the calling conventions to change.

This works using go build for me

An alternative would be to pin the jwt dependency to the particular v2 version string that was used to build this repo, if the maintainers prefer.

[13rac1]

Ideally this should be converted to go mod with the current Go version.

[v01dpointer]

Added the module files that worked for me

(am a noob here, so ymmv)

[oldmonad]

The go-jwt package has breaking api changes from v2 to v3, requiring some of the calling conventions to change.

This works using go build for me

An alternative would be to pin the jwt dependency to the particular v2 version string that was used to build this repo, if the maintainers prefer.

Thank you!