osinfo-db: 20180416 -> 20180502

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

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

These checks were done:

- built on NixOS
- Warning: no binary found that responded to help or version flags. (This warning appears even if the package isn't expected to have binaries.)
- found 20180502 with grep in /nix/store/xsgfilzqf0fkahxgp24ivs90xy8mz6rs-osinfo-db-20180502
- directory tree listing: https://gist.github.com/38c69c0bcc2f185f90e5c56f329dc980