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Add instance Random DiffTime #156

@domenkozar

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@domenkozar
instance Random DiffTime where
  random :: (RandomGen g) => g -> (DiffTime, g)
  random g =
    let (i, g') = random g
     in (picosecondsToDiffTime $ fromIntegral (i :: Integer), g')

  randomR :: RandomGen g => (DiffTime, DiffTime) -> g -> (DiffTime, g)
  randomR (a, b) g =
    let (i, g') = randomR (diffTimeToPicoseconds a, diffTimeToPicoseconds b) g
     in (picosecondsToDiffTime i, g')

Note that the instance can't go into time because of random -> splitmix -> time dependency chain.

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