This release adds support for command line argument values that are lists.
For example, given an `ArgumentParser` argument with `action="append"`, the entire list of values will be available:
python
parser.add_argument("--tag", action="append")
...
def make_args(cls, args: CommandLineArguments) -> StageTaskArguments:
tags = args.get_list("tag", []))
When run with "--tag foo --tag bar", tags == ["foo", "bar"]