NumericUnderscores extension was added to Cabal for ghc 8.6

[Takenobu Tani]

Dear devs,

The `NumericUnderscores` extension was added to Cabal for ghc 8.6. [1]
I'm sending this mail referring to `BlockArguments`. [2]

[1] https://github.com/haskell/cabal/pull/5130
[2] https://mail.haskell.org/pipermail/ghc-devs/2018-February/015341.html

Regards,
Takenobu
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