Add some API disclaimers to Language.Haskell.TH.Lens (#856)
Add some API disclaimers to Language.Haskell.TH.Lens (#856)

In lieu of #844, we should attempt to advertise the fact that the
API offered by `Language.Haskell.TH.Lens` is not stable among
different versions of `template-haskell`.
ddssff/lens