Hi,

I was just getting started with oapi-codegen, and thanks a lot for the awesome tool!

One question I have, is that - unless I'm doing something wrong - the request body isn't automatically unmarshalled, so you have to do something like this: https://github.com/deepmap/oapi-codegen/blob/master/examples/petstore-expanded/echo/api/petstore.go#L85-L86

func (p *PetStore) AddPet(ctx echo.Context) error {
	// We expect a NewPet object in the request body.
	var newPet NewPet
	err := ctx.Bind(&newPet)

Whereas, for the other types of parameters, you get a handy struct with things pre-filled:

https://github.com/deepmap/oapi-codegen/blob/master/examples/petstore-expanded/echo/api/petstore.go#L53

func (p *PetStore) FindPets(ctx echo.Context, params FindPetsParams) error {

Is that by design? Not a massive issue, but wouldn't it make more sense to treat the bodies the same way?

Thanks!