astroid 2.6.0

on Python PyPI

Appveyor and travis are no longer used in the continuous integration

setuptools_scm has been removed and replaced by tbump in order to not
have hidden runtime dependencies to setuptools

NodeNg, the base node class, is now accessible from astroid or
astroid.nodes as it can be used for typing.

Update enum brain to improve inference of .name and .value dynamic class
attributes

Closes PyCQA/pylint#1932
Closes PyCQA/pylint#2062
Closes PyCQA/pylint#2306

Removed Repr, Exec, and Print nodes as the ast nodes
they represented have been removed with the change to Python 3

Deprecate Ellipsis node. It will be removed with the next minor release.
Checkers that already support Python 3.8+ work without issues. It's only
necessary to remove all references to the astroid.Ellipsis node.
This changes will make development of checkers easier as the resulting tree for Ellipsis
will no longer depend on the python version. Background: With Python 3.8 the
ast.Ellipsis node, along with ast.Str, ast.Bytes, ast.Num,
and ast.NamedConstant were merged into ast.Constant.

Deprecated Index and ExtSlice nodes. They will be removed with the
next minor release. Both are now part of the Subscript node.
Checkers that already support Python 3.9+ work without issues.
It's only necessary to remove all references to the astroid.Index and
astroid.ExtSlice nodes. This change will make development of checkers
easier as the resulting tree for ast.Subscript nodes will no longer
depend on the python version. Background: With Python 3.9 ast.Index
and ast.ExtSlice were merged into the ast.Subscript node.

Updated all Match nodes to be internally consistent.

Add Pattern base class.