GHC.Generics instances for {From,To}YAML

[l29ah]

It would be great if HsYAML would be able to generate the instances automagically through generics, like aeson does, so that there would be no need to tediously mirror data declarations with trivial instances.

[andreasabel]

This package is not actively developed, needs a maintainer:

• The HsYAML family needs (an) active maintainer(s) #59