Gitlab-trace

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- Warn about unused command-line arguments (--branch when --job or
pipeline is specified, --artifacts when no job is specified).
- Allow referring to the Nth latest pipeline with -1, -2, -3 instead
of the pipeline number.
- Fix TypeError: sequence item 0: expected str instance, int found
while printing "Found multiple jobs"
- ``--print-url`` for printing the job's or pipeline's URL instead of dumping
the log/list of jobs.
- ``--debug`` now works for pipelines as well.
- Add Python 3.9 support.

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- Suppress tracebacks for keyboard interrupt or broken pipe errors.
- ``-a``/``--artifacts`` for downloading a job's artifacts.zip to the current
working directory.

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- 100% test coverage.
- Fixes for Python 3.6 compatibility (subprocess.run() doesn't
accept 'text' or 'capture_output' keyword arguments).
- ``--verbose`` shows job start/finish times and duration on stderr.
- ``--debug`` for seeing raw JSON data available from GitLab API.

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- Colorized job status output.
- Do not ignore jobs beyond the first batch of 20.

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- Ported to Python, made it 2x faster.
- First PyPI release.

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- gitlab-trace was a bash script in my scripts repository:
https://github.com/mgedmin/scripts/blob/1e673264db3678b473f9269b27e5e9994942fc4b/gitlab-trace