python27Packages.youtube-dl: 2018.05.01 -> 2018.05.09

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

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

These checks were done:

- built on NixOS
- ran ‘/nix/store/0shcgv9l70mwrzwsii5hgya7nx89j6w6-youtube-dl-2018.05.09/bin/.youtube-dl-wrapped -h’ got 0 exit code
- ran ‘/nix/store/0shcgv9l70mwrzwsii5hgya7nx89j6w6-youtube-dl-2018.05.09/bin/.youtube-dl-wrapped --help’ got 0 exit code
- ran ‘/nix/store/0shcgv9l70mwrzwsii5hgya7nx89j6w6-youtube-dl-2018.05.09/bin/.youtube-dl-wrapped --version’ and found version 2018.05.09
- ran ‘/nix/store/0shcgv9l70mwrzwsii5hgya7nx89j6w6-youtube-dl-2018.05.09/bin/youtube-dl -h’ got 0 exit code
- ran ‘/nix/store/0shcgv9l70mwrzwsii5hgya7nx89j6w6-youtube-dl-2018.05.09/bin/youtube-dl --help’ got 0 exit code
- ran ‘/nix/store/0shcgv9l70mwrzwsii5hgya7nx89j6w6-youtube-dl-2018.05.09/bin/youtube-dl --version’ and found version 2018.05.09
- found 2018.05.09 with grep in /nix/store/0shcgv9l70mwrzwsii5hgya7nx89j6w6-youtube-dl-2018.05.09
- directory tree listing: https://gist.github.com/e65e7afdbb0bcdbcf461cd2a77c6ad50