build with ghc-8.8

[jwaldmann]

for #24

I am not sure about empty instance MondFail Result.

Cannot run tests since regex-base cannot be built.

[jwaldmann]

.. empty instance

.. where fail = error is better as it seems to give exactly the old behaviour

[jwaldmann]

Hi @nominolo could you please make a hackage release

[JorikSchellekens]

Just wondering if there's a reason this hasn't made release?

[FranklinChen]

I think this project, as many (most) individual open source projects, has been abandoned.