Yg-lockfile

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5: Prefer `tempora <https://pypi.org/project/tempora>`_ to
jaraco.timing.

4: Consolidate acquire, release, and is_locked behavior into LockBase.
Atomically remove lock attribute during release. Use jaraco.functools
1.16 for the retry logic.

Update package skeleton.

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Correct badges in README.

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2: Suppress errors in the rare condition where the lockfile has
disappeared between the release of the lock and the deletion of
the file.

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3: Moved project to Github.

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Re-use Stopwatch class from jaraco.timing.

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Dropped support for Python 2.6.