Unix: log shell and call commands at INFO (Closes ProgVal/Limnoria#929)
Unix: update logging
Unix: Update logging again
Merge pull request #947 from GLolol/unix/log-commands

Unix: log shell and call commands at INFO
PluginDownloader: improve README.md

featuring ~~faked~~ log of installing Wikipedia plugin.

[CI SKIP]
Merge pull request #950 from Mikaela/plugindownloader

PluginDownloader: improve README.md