Targ

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General maintenance - dropping Python 3.7 support, adding Python 3.12, updating
dependencies, and fixing linter errors.

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Slackened dependencies to avoid clashes with other libraries, like ``fastkafka``.

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If an exception is raised when running a command, mention the ``--trace``
option, which will show a full stack trace.

Added docstring to ``Command``.

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Added Python 3.10 support.

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Fixing a bug with the ``--trace`` option, which outputs a traceback if an
exception occurs.

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Commands will now work if the type annotation of an argument is missing - in
this case the type of the argument is assumed to be a string.