See also https://pvp.haskell.org/faq

## 0.2.1.0 *(minor)*

 - Added `Newtype` instances for
     - `Data.Fixed.Fixed`
     - `Data.Functor.Compose.Compose`
     - `Data.Functor.Identity.Identity`
     - `Data.Monoid.Alt`
     - `Data.Monoid.Ap`
     - `Data.Monoid.Dual`
     - `Data.Ord.Down`
  - Declare `Control.Newtype` explicitly as `Trustworthy` under SafeHaskell