Updating README with info about cabal exec for sandboxes
Updating README with info about cabal exec for sandboxes

beni55/IHaskell,thomasjm/IHaskell,thomasjm/IHaskell,sumitsahrawat/IHaskell,gibiansky/IHaskell,wyager/IHaskell,kfiz/IHaskell,franklx/IHaskell,gibiansky/IHaskell,wyager/IHaskell,wyager/IHaskell,wyager/IHaskell,qzchenwl/IHaskell,qzchenwl/IHaskell,FranklinChen/IHaskell,artuuge/IHaskell,sumitsahrawat/IHaskell,FranklinChen/IHaskell,thomasjm/IHaskell,kfiz/IHaskell,FranklinChen/IHaskell,FranklinChen/IHaskell,qzchenwl/IHaskell,beni55/IHaskell,thomasjm/IHaskell,qzchenwl/IHaskell,franklx/IHaskell,artuuge/IHaskell,artuuge/IHaskell,gibiansky/IHaskell,kfiz/IHaskell,beni55/IHaskell,artuuge/IHaskell,franklx/IHaskell,sumitsahrawat/IHaskell,kfiz/IHaskell,beni55/IHaskell,franklx/IHaskell