Relax upper bound to allow upcoming binary-0.8
Relax upper bound to allow upcoming binary-0.8

This is needed in order to be able to update GHC HEAD to
use binary-0.8 as planned for GHC 8.0

/cc @kolmodin

edsko/cabal,themoritz/cabal,martinvlk/cabal,Heather/cabal,sopvop/cabal,thomie/cabal,themoritz/cabal,mydaum/cabal,gbaz/cabal,martinvlk/cabal,bennofs/cabal,mydaum/cabal,bennofs/cabal,thomie/cabal,gbaz/cabal,headprogrammingczar/cabal,lukexi/cabal,sopvop/cabal,lukexi/cabal,garetxe/cabal,randen/cabal,kolmodin/cabal,headprogrammingczar/cabal,garetxe/cabal,Heather/cabal,randen/cabal,sopvop/cabal,edsko/cabal,kolmodin/cabal,themoritz/cabal