Add support for shell autocompletion
We should (optionally) install tab-completion scripts for swiftly. This will make it easier for users to remember certain commands and to select among installed toolchains.
Should this have been closed? Not sure PR is linked to correct issue.
Whoops, yes thanks for catching this. #69 was the one meant to be closed.
This is actually coming out of the box from the swift-argument-parser library that we use. Do we need to keep this open? Maybe this is a placeholder for writing some docs describing how to do it from swiftly?
https://apple.github.io/swift-argument-parser/documentation/argumentparser/installingcompletionscripts