Add @Pre support for @Params

[loicnestler]

Hey!

I discovered koa-joi-controllers a few weeks ago and I'm absolutely in love with it!
I'm currently building the backend for a local startup and came across the following problem:

I have one route (/api/projects/:id) with multiple methods (PUT, DELETE, GET, ...) and was wondering if there is any option to add a @Pre (for example to check json web tokens) to a @Params?

Thanks a lot!