Repoze.retry

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- Add support for Python 3.9, 3.10, and 3.11.

- Drop support for Python 2.7, 3.5, and 3.6.

- Switch to use 'pytest' for running unit tests.

- Add Github Actions workflow to exercise unit tests / coverage.

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- Add support for Python 3.6, 3.7, and 3.8.

- Drop support for Python 3.3 and 3.4.

- Add configurable delay-with-backof when retrying.

- Retry ``transaction.interfaces.TransientError`` (if importable) by default.

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- Add support for testing under Travis.

- Add support for Python 3.4 and 3.5 and PyPy3.

- Drop support for Python 2.6 and 3.2.

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- Add support for Python 3.2 and 3.3.

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- Make sure app_iter gets closed when there is a broken pipe or other exception
that interrupts the response generator.

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- Allow suppression of tracebacks being written to wsgi.errors during
retries.

- Fix handling of case where environ['CONTENT_LENGTH'] is an empty string.