mediainfo: 18.03.1 -> 18.05

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

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

These checks were done:

- built on NixOS
- ran ‘/nix/store/5ckclh9xvqkrp4a329s8w294ggv0mm48-mediainfo-18.05/bin/mediainfo -h’ got 0 exit code
- ran ‘/nix/store/5ckclh9xvqkrp4a329s8w294ggv0mm48-mediainfo-18.05/bin/mediainfo --help’ got 0 exit code
- directory tree listing: https://gist.github.com/5fa8e019ba53a84987e3b8d9e47a91af