hackage-packages.nix: update Haskell package set
This update was generated by hackage2nix v20160308-3-g8057d11 using the following inputs: - Nixpkgs:9da84a6af0- Hackage:1e26fd1876- LTS Haskell:6c45757bda- Stackage Nightly:d8a2cae779
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