src/Cabal2Nix/Flags.hs: sort flags alphabetically
src/Cabal2Nix/Flags.hs: sort flags alphabetically

gridaphobe/cabal2nix,psibi/cabal2nix,jb55/cabal2nix,spencerjanssen/cabal2nix,bennofs/cabal2nix,dmalikov/cabal2nix,Fuuzetsu/cabal2nix