- update to 0.5.4
* Backported Bits, FiniteBits, Floating, Fractional, Integral, IsString, Num, Real,
RealFloat, and RealFrac instances for Identity and Const

- update to 0.5.3
* Backported Alternative, MonadPlus and MonadZip instances for U1 and Proxy, and
made the Functor, Foldable, Traversable, Alternative, and Monad instances for
U1 lazier to correspond with base-4.9

- update to 0.5.2
* Backported Enum, Bounded, Ix, Functor, Applicative, Monad, MonadFix, MonadPlus,
MonadZip, Foldable, Traversable, and Data instances for datatypes
in the GHC.Generics module (introduced in base-4.9)

- update to 0.5.1
* The Storable instances for Complex and Ratio are now exactly
as lazy as their counterparts in base

- update to 0.5.0
* Backported instances introduced in GHC 8.0/base-4.9

- update to 0.4.5
* Import Control.Monad.Instances
* Fix build on GHC HEAD (again)