Fix typo in README.md
Fix typo in README.md

Change "simply" to "simple".
sumitsahrawat/IHaskell,wyager/IHaskell,qzchenwl/IHaskell,kfiz/IHaskell,kfiz/IHaskell,aostiles/LiveHaskell,thomasjm/IHaskell,sumitsahrawat/IHaskell,artuuge/IHaskell,gibiansky/IHaskell,gibiansky/IHaskell,FranklinChen/IHaskell,beni55/IHaskell,kfiz/IHaskell,qzchenwl/IHaskell,aostiles/LiveHaskell,qzchenwl/IHaskell,aostiles/LiveHaskell,FranklinChen/IHaskell,qzchenwl/IHaskell,wyager/IHaskell,thomasjm/IHaskell,franklx/IHaskell,beni55/IHaskell,gibiansky/IHaskell,franklx/IHaskell,artuuge/IHaskell,wyager/IHaskell,thomasjm/IHaskell,FranklinChen/IHaskell,beni55/IHaskell,sumitsahrawat/IHaskell,franklx/IHaskell,artuuge/IHaskell,beni55/IHaskell,FranklinChen/IHaskell,franklx/IHaskell,thomasjm/IHaskell,artuuge/IHaskell,kfiz/IHaskell,wyager/IHaskell