Missing

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- Nothing changed yet.

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- Drop support for Python 2.7, 3.5, 3.6.

- Deprecate ``._Missing`` which containes just BBB imports.

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- Add support for Python 3.8, 3.9, 3.10, 3.11

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- Drop support for Python 3.4.

- Add support for Python 3.7.

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- Restore `Missing._Missing` module for pickle compatibility with the old
C extension version. [https://github.com/zopefoundation/Missing/issues/3]

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- Add support for bytes and matrix multiplication.

- Remove the Python 2-only C extension.