V1.0.0 Release

Only change is to use Apple's new ArgumentParser framework. This is now a dependency on the source.
Use Xcode's package manager to add the https://github.com/apple/swift-argument-parser as a Swift package.
The older V0.9.0 release can be used if you don't want to bother. There were no other changes.

V0.9.0 Release

Older release using original command-line interface.
Provided to ensure backward compatibility with anyone using the old CLI.