Argcomplete

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- activate-global-python-argcomplete runs on Homebrew out of the box

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- Correctly handle suggestions for positionals with variable-length nargs. Thanks to evanunderscore (132, 133).

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- Correctly handle suggestions with custom nargs for optionals. Thanks to evanunderscore (131).

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- Fix propagation of partially parsed subparser namespace into parent parser namespace upon subparser failure due to
partial args. This allows completers to access partial parse results for subparser optionals in parsed_args (114).
- The default completer can now be specified when manually instantiating CompletionFinder. Thanks to avylove (130).

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- Use FilesCompleter as default completer fallback (120).

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- Recognize subclasses of argparse._SubParsersAction. Thanks to Stephen Koo (118).
- Support parsed_args in custom completers with missing args. Thanks to Dan Kilman (124).
- Non-ASCII support in FilesCompleter.
- Automatically enable FilesCompleter for argparse.FileType arguments.