bitstring-3.1.9

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July 20th 2021: version 3.1.9 released

(version 3.1.8 was pulled due to serious issues)
Another maintenance release.

• Fixed a couple of outdated results in the readme (Issue 214).
• Some more documentation tidying.
• Turned off some debug code by default.
• Fixed a couple of failing tests in different Python versions.
• Fix for consistent pos initialisation semantics for different types.
• Change to allow wheels to be uploaded to PyPI.
• More work for LSB0 mode, but still not finished or documented (sorry).