Please add Go module

[willfaught]

Hey @maraino! :)

[maraino]

Hi @willfaught, are you still using it, I only use gomock because of the code generation, and I've just realized, the original gomock is no longer maintained.

[willfaught]

By gomock, do you mean this repo? What do you mean by original gomock?

I use this repo sometimes to mock small things by hand.

[maraino]

I meant the gomock package from github.com/golang/mock, but now maintained by go.uber.org/mock