swiftly self-uninstall which the readme suggests doesn't exist

The readme claims there is a `swiftly self-uninstall`. However when executing this I get ``` $ swiftly self-uninstall Error: Unexpected argument 'self-uninstall' Usage: swiftly <subcommand> See 'swiftly --help' for more information. ``` What's up with that? I am trying to figure out why I get double output from checking for updates like this, so I tried uninstalling: ``` $ swiftly self-update Checking for swiftly updates... Checking for swiftly updates... Already up to date. ``` I do have version 1.1.1