dev-haskell/conduit: bump up to 0.5.6

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
dev-haskell/wai-extra: bump up to 1.3.1.1

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
dev-haskell/graphviz: bump up to 2999.15.0.1

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