Argh

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Backwards incompatible changes:

- Wrapped exceptions now cause ``dispatching.dispatch()`` to raise
``SystemExit(1)`` instead of returning without error. For most users, this
means failed commands will now exit with a failure status instead of a
success. (161)

Deprecated:

- Renamed arguments in `add_commands()` (165):

- `namespace` → `group_name`
- `namespace_kwargs` → `group_kwargs`

The old names are deprecated and will be removed in v.0.30.

Enhancements:

- Can control exit status (see Backwards Incompatible Changes above) when
raising ``CommandError`` using the ``code`` keyword arg.

Bugs fixed:

- Positional arguments should not lead to removal of short form of keyword
arguments. (115)

Other changes:

- Avoid depending on iocapture by using pytest's built-in feature (177)

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- Fixed bugs in tests (171, 172)

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A major cleanup.

Backward incompatible changes:

- Dropped support for Python 2.7 and 3.7.

Deprecated features, to be removed in v.0.30:

- `argh.assembling.SUPPORTS_ALIASES`.

- Always `True` for recent versions of Python.

- `argh.io.safe_input()` AKA `argh.interaction.safe_input()`.

- Not relevant anymore. Please use the built-in `input()` instead.

- argument `pre_call` in `dispatch()`.

Even though this hack seems to have been used in some projects, it was never
part of the official API and never recommended.

Describing your use case in the `discussion about shared arguments`_ can
help improve the library to accomodate it in a proper way.

.. _discussion about shared arguments: https://github.com/neithere/argh/issues/63

- Argument help as annotations.

- Annotations will only be used for types after v.0.30.
- Please replace any instance of::

def func(foo: "Foobar"):

with the following::

arg('-f', '--foo', help="Foobar")
def func(foo):

It will be decided later how to keep this functionality "DRY" (don't repeat
yourself) without conflicts with modern conventions and tools.

- Added deprecation warnings for some arguments deprecated back in v.0.26.

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Minor packaging fix:

* chore: include file required by tox.ini in the sdist (155)

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Minor building and packaging fixes:

* docs: add Read the Docs config (160)
* chore: include tox.ini in the sdist (155)

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This is the last version to support Python 2.7.

Backward incompatible changes:

- Dropped support for Python 2.6.

Enhancements:

- Added support for Python 3.7 through 3.11.
- Support introspection of function signature behind the `wraps` decorator
(issue 111).

Fixed bugs:

- When command function signature contained ``**kwargs`` *and* positionals
without defaults and with underscores in their names, a weird behaviour could
be observed (issue 104).
- Fixed introspection through decorators (issue 111).
- Switched to Python's built-in `unittest.mock` (PR 154).
- Fixed bug with `skip_unknown_args=True` (PR 134).
- Fixed tests for Python 3.9.7+ (issue 148).

Other changes:

- Included the license files in manifest (PR 112).
- Extended the list of similar projects (PR 87).
- Fixed typos and links in documentation (PR 110, 116, 156).
- Switched CI to Github Actions (PR 153).