[PROPOSAL] Adding Generics-based DefaultSignature to `deepseq` package

[Andres Löh]

> The Proposal
> ============
>
> I hereby propose to merge `deepseq-generics`[2] into `deepseq`[1] in
> order to add Generics support to the `NFData` class based on the
> `-XDeriveGenerics` and `-XDefaultSignature` language extensions.
>
> A concrete patch is available for bike-review at [3]

+1

Cheers,
  Andres