default[:haskell][:multi] = {
  :ghcs => ["7.8.1","7.6.3","7.4.2","7.0.4"],
  :default => "7.6.3"
}

default[:haskell][:multi] = {
  :ghcs => ["7.8.2","7.6.3","7.4.2","7.0.4"],
  :default => "7.6.3"
}

Use ghc-7.8.2 instead of 7.8.1
Use ghc-7.8.2 instead of 7.8.1
