Automap

This release adds support for Python 3.11, and includes built wheels for CPython 3.11 on all operating systems.

This release updates `automap.NonUniqueError.args` to contain the duplicate key itself, rather than a human-readable string. It also adds back "best effort" support for PyPy, which was unintentionally broken in the last release.

This release adds `automap.NonUniqueError`, which replaces `ValueError`s that were previously raised when adding duplicate values. For backward-compatibility, `automap.NonUniqueError` has been made a subclass of `ValueError`.

It also refactors many of the `automap` internals, resulting in more maintainable code and better memory management. As an indirect result, `AutoMap` and `FrozenAutoMap` now support the full set of rich comparison operators (exhibiting the same behavior as a comparison between lists of their keys).

This release fixes some issues with the wheel build process.

**This release drops support for Python 3.6.** It also includes built wheels for CPython 3.9 and 3.10 on all operating systems.

This release contains wheel builds for 32- and 64-bit Windows.