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Release Date: 2021-05-09

* Fix six.with_metaclass transformation so it doesn't break user defined transformations.

* Fix detection of relative imports.
Closes 930
Closes PyCQA/pylint4186

* Fix inference of instance attributes defined in base classes

Closes 932

* Update `infer_named_tuple` brain to reject namedtuple definitions
that would raise ValueError

Closes 920

* Do not set instance attributes on builtin object()

Closes 945
Closes PyCQA/pylint4232
Closes PyCQA/pylint4221
Closes PyCQA/pylint3970
Closes PyCQA/pylint3595

* Fix some spurious cycles detected in ``context.path`` leading to more cases
that can now be inferred

Closes 926

* Add ``kind`` field to ``Const`` nodes, matching the structure of the built-in ast Const.
The kind field is "u" if the literal is a u-prefixed string, and ``None`` otherwise.

Closes 898

* Fix property inference in class contexts for properties defined on the metaclass

Closes 940

* Update enum brain to fix definition of __members__ for subclass-defined Enums

Closes PyCQA/pylint3535
Closes PyCQA/pylint4358

* Update random brain to fix a crash with inference of some sequence elements

Closes 922

* Fix inference of attributes defined in a base class that is an inner class

Closes 904

* Allow inferring a return value of None for non-abstract empty functions and
functions with no return statements (implicitly returning None)

Closes 485

* scm_setuptools has been added to the packaging.

* Astroid's tags are now the standard form ``vX.Y.Z`` and not ``astroid-X.Y.Z`` anymore.

* Add initial support for Pattern Matching in Python 3.10