Add semigroup superclass when available from base #54
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I don't necessarily want to import semigroups and take in all of those
dependencies, so I use a bit of CPP around the base version in which
Data.Semigroup appeared and set up the superclass in that case.
This is for #53
@mithrandi @ozataman let me know if you have any particular opinions here, otherwise I'll merge it. The short explanation is this adds no new dependencies because it doesn't target
semigroups
but rather provides an instance forSemigroup
if you have a recent enough base that its available.