src/Cabal2Nix/PostProcess.hs: add postInstall hook to install cabal-install's bash completion file
src/Cabal2Nix/PostProcess.hs: add postInstall hook to install cabal-install's bash completion file

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