Update to semigroups-0.19.1

0.19.1 [2019.08.27]
* Add GenericSemigroupMonoid, an adapter newtype suitable for
  DerivingVia, to Data.Semigroup.Generic.
* Work around a bug related to the backported Generic(1) instances in
  this package (that could only be triggered on GHC 7.2 or 7.4) in
  which the hand-written Datatype, Constructor, and Selector instances
  for internal data types could overlap with GHC-generated instances.

0.19 [2019.05.10]
* The (<>) method of the backported Semigroup class no longer has a
  default implementation in terms of mappend. This mirrors the
  Data.Semigroup API that was introduced in base-4.9. This is a
  breaking change for any Semigroup instances that are defined in
  tandem with versions of base older than 4.9.
* Make the backported Hashable Arg instance reflect its respective
  variants in the hashable package. In hashable-1.3, the Hashable Arg
  instance only hashes the first argument, lest equal values have
  different hashes.
* Backport the Lift (NonEmpty a) instance introduced in
  template-haskell-2.15.0.0.
* Data.List.NonEmpty is now unconditionally Trustworthy.

0.18.5 [2018.07.02]
* Use a more efficient sconcat for the Semigroup instances for strict
  and lazy ByteString.

0.18.4 [2018.01.29]
* Backport Semigroup instances for Data.Ord.Down and strict ST, which
  were added in base-4.11.

0.18.3
* Add Semigroup instance for IO, as well as for Event and Lifetime
  from GHC.Event
* Add Eq1, Ord1, Read1, and Show1 instances for NonEmpty
* Define Generic and Generic1 instances back to GHC 7.2, and expose
  the Data.Semigroup.Generic module on GHC 7.2

0.18.2
* Depend on the bytestring-builder package to ensure Semigroup
  instances for bytestring Builder and ShortByteString are always
  defined
* Allow building with binary-0.8.3 and later

0.18.1
* Add the missing instance for Data.Binary.Builder.Builder.

0.18.0.1
* Added support for base-4.9

0.18
* Removed the partial functions words, unwords, lines, unlines

0.17.0.1
* Fixed the @since annotations

0.17
* Added groupWith, groupAllWith, groupWith1, groupAllWith1
* Renamed sortOn to sortWith to match the "Comprehensive
  comprehensions" paper and TransformListComp extension.
* Add Semigroup instances for Alt, Void, Proxy and Tagged
* Add Num instances for Min and Max
* Removed times1p in favor of stimes.

0.16.2.2
* Cleaned up imports to remove warnings on GHC 7.10.

0.16.2.1
* Restored the ability to build on GHC < 7.6. (Generic1 deriving was only added in GHC 7.6)

0.16.2
* Added genericMappend and supporting GSemigroup class for generically
  deriving Semigroup instances.
* Added Arg a b which only compares for equality/order on its first
  argument, which can be used to compute argmin and argmax.
* Add Bifunctor Arg instance to avoid orphans for GHC 7.10+.
* Added missing Data.Monoid.Generic module to source control.

0.16.1
* Added Semigroup instances for various Builder constructions in text
  and bytestring where available.
* Added MonadFix and MonadPlus instances for NonEmpty.

0.16.0.1
* Bumped deepseq version bound for GHC 7.10 compatibility.

0.16
* times1p and timesN are now reduced to accepting only a Natural
  argument. Whole doesn't exist in GHC 7.10's Numeric.Natural, and
  nats version 1 has removed support for the class.

0.15.4
* Use Data.Coerce.coerce on GHC 7.8+ to reduce the number of
  eta-expansions in the resulting core.
* Avoid conflict with pending Foldable.length in base.

(pho)