perhaps-0: dependencies

Dependencies for perhaps-0

library	base (>=4.3 && <5) mtl (>=2.1 && <2.3) transformers (>=0.3 && <0.6) transformers-compat (>=0.3 && <1) if impl(ghc>=7.2) && impl(ghc<7.6) generic-deriving (>=0.3.1 && <1.13) if impl(ghc<7.10) void (>=0.5.0 && <1) if impl(ghc<8.0) semigroups (>=0.10 && <1)