[Haskell-cafe] [ANN] linear-generics-0.2

This new major version improves the GHCGenerically1 DerivingVia target. Previously, it worked on strictly fewer types than GHC could derive Generic1 for. Now it works on strictly more types than that. It does this by using a derived Generic instance instead of a derived Generic1 instance, thanks to the magic of quantified constraints. For anyone already using the package, the upgrade path is trivial: just derive any additional Generic instances GHC asks for.