ArgumentParser 0.2.1

Additions

• You can now generate Bash and Zsh shell completion scripts for commands,
  either by using the --generate-completion-script flag when running a
  command, or by calling the static completionScript(for:) method on a root
  ParsableCommand type. See the guide to completion scripts for
  information on customizing and installing the completion script for your
  command.

Fixes

• Property wrappers without parameters can now be written without parentheses
  — e.g. @Flag var verbose = false.
• When displaying default values for array properties, the help screen now
  correctly uses the element type's ExpressibleByArgument conformance to
  generate the description.
• Running a project that defines a command as its own subcommand now fails with
  a useful error message.