MissingH.cabal: switch to cabal-1.8 unit tests, allow QuickCheck up to 2.6
MissingH.cabal: switch to cabal-1.8 unit tests, allow QuickCheck up to 2.6

Signed-off-by: Sergei Trofimovich <110fdadc76b6bce16977f568bdb4723eaed6fb3f@gentoo.org>

haskellbr/missingh