[Nix-dev] GHC 7.10.2 is our new default compiler

[Peter Simons]

Hi guys,

starting with revision 2d26a0f8, GHC 7.10.2 is our new default compiler,
i.e. the compiler that's used to build the "haskellPackages" set. We'll keep
"haskell.packages.ghc7101" around for a little while, but eventually that
older compiler will be removed from Nixpkgs (since we generally keep only
one compiler version per major release).

Best regards,
Peter