Semi-automatic update generated by https://github.com/ryantm/nixpkgs-update tools.

This update was made based on information from https://repology.org/metapackage/x42-plugins/versions.

These checks were done:

- built on NixOS
- ran ‘/nix/store/92qs2yp1dsm7mpw3q2ynh8l0vihfm8mb-x42-plugins-20180320/bin/x42-fat1 -h’ got 0 exit code
- ran ‘/nix/store/92qs2yp1dsm7mpw3q2ynh8l0vihfm8mb-x42-plugins-20180320/bin/x42-fat1 --help’ got 0 exit code
- ran ‘/nix/store/92qs2yp1dsm7mpw3q2ynh8l0vihfm8mb-x42-plugins-20180320/bin/x42-fil4 -h’ got 0 exit code
- ran ‘/nix/store/92qs2yp1dsm7mpw3q2ynh8l0vihfm8mb-x42-plugins-20180320/bin/x42-fil4 --help’ got 0 exit code
- ran ‘/nix/store/92qs2yp1dsm7mpw3q2ynh8l0vihfm8mb-x42-plugins-20180320/bin/x42-meter -h’ got 0 exit code
- ran ‘/nix/store/92qs2yp1dsm7mpw3q2ynh8l0vihfm8mb-x42-plugins-20180320/bin/x42-meter --help’ got 0 exit code
- ran ‘/nix/store/92qs2yp1dsm7mpw3q2ynh8l0vihfm8mb-x42-plugins-20180320/bin/x42-mixtri -h’ got 0 exit code
- ran ‘/nix/store/92qs2yp1dsm7mpw3q2ynh8l0vihfm8mb-x42-plugins-20180320/bin/x42-mixtri --help’ got 0 exit code
- ran ‘/nix/store/92qs2yp1dsm7mpw3q2ynh8l0vihfm8mb-x42-plugins-20180320/bin/x42-scope -h’ got 0 exit code
- ran ‘/nix/store/92qs2yp1dsm7mpw3q2ynh8l0vihfm8mb-x42-plugins-20180320/bin/x42-scope --help’ got 0 exit code
- ran ‘/nix/store/92qs2yp1dsm7mpw3q2ynh8l0vihfm8mb-x42-plugins-20180320/bin/x42-stepseq -h’ got 0 exit code
- ran ‘/nix/store/92qs2yp1dsm7mpw3q2ynh8l0vihfm8mb-x42-plugins-20180320/bin/x42-stepseq --help’ got 0 exit code
- ran ‘/nix/store/92qs2yp1dsm7mpw3q2ynh8l0vihfm8mb-x42-plugins-20180320/bin/x42-tuna -h’ got 0 exit code
- ran ‘/nix/store/92qs2yp1dsm7mpw3q2ynh8l0vihfm8mb-x42-plugins-20180320/bin/x42-tuna --help’ got 0 exit code
- directory tree listing: https://gist.github.com/b5bff61b6a034a2f1ebe040e1e3155d0

x42-plugins: 20170428 -> 20180320