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Release Date: 2021-06-22

* 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/pylint1932
Closes PyCQA/pylint2062
Closes PyCQA/pylint2306

* 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.