Add NonEmptyMap and NonEmptySet to containers

[Ruben Astudillo]

On 19-09-19 22:17, Alexandre Esteves wrote:
> I do like the sound of `instance Foldable1 Set1` more than I do
> `instance NonEmptyFoldable NonEmptySet`
> <https://hackage.haskell.org/package/semigroupoids-5.3.3/docs/Data-Semigroup-Foldable.html#t:Foldable1>

I prefer it too, I just wish (future) documentation included a little
explanation on why the suffix 1 was put.

-- 
-- Ruben
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