v2.5.7

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

• Fix detection of relative imports.
  Closes #930
  Closes pylint-dev/pylint#4186

• 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 pylint-dev/pylint#4232
Closes pylint-dev/pylint#4221
Closes pylint-dev/pylint#3970
Closes pylint-dev/pylint#3595

• 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 pylint-dev/pylint#3535
  Closes pylint-dev/pylint#4358

• 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