- Update from Plasma 5.7.0 to 5.7.1.
- Remove the version number from the directory storing the Plasma Nix
expressions. It is not necessary to version the Nix expressions now
that we keep only one version in Nixpkgs.
- Fix a bug in generate-kde-plasma.sh which prevented it from finding
its helper script.
- Automatically redirect the output of generate-kde-plasma.sh to make
the update script even easier to use.
