Added Python v3.11 to the tests.

Updated the versions of Python in the tests to the latest available.

Fixed the meta-data for pickle.

Fixed the metadata for multiprocessing.reduction that caused it (and …

…everything

that depended on it) to be Windows only.

Released as v3.1.1.

Released as v3.1.0.

Released as v3.0.0.

Released as v2.5.1.

Released as v2.5.0.

Released as v2.4.

Released as v2.3.1.