Avoid conduit build failure (GHC 7.6.3, cabal 1.20)

Under GHC 7.6.3 lio-simple 0.0.2.2 fails to build unless conduit < 1.1.*. Getting conduit build problem out of the way by constraining to 1.0.* range. Probably not the right long-term solution, but unblocks me.

$ ghc --version
The Glorious Glasgow Haskell Compilation System, version 7.6.3
$ cabal --version
cabal-install version 1.20.0.0
using version 1.20.0.0 of the Cabal library