Supported driver versions

[maximelkin]

@kibertoad which versions of drivers we actually should support?
i.e. Can users rely on pg of non-latest major version?

If so, maybe we should mark it in peerDependencies (>x && >y etc) and comment in docs (readme)

[elhigu]

We are only testing with most recent ones so I suppose we officially support just latest major version which has been released when certain knex release was done.

If someone likes to use some other version they can try it, but I don't think there is any reason why we should support them officially. I suppose that could be documented in peerDependencies, but will that prevent people from trying out some other driver versions?