attrs/changelog.d/815.change.rst

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``__match_args__`` are now generated to support Python 3.10's
`Structural Pattern Matching <https://docs.python.org/3.10/whatsnew/3.10.html#pep-634-structural-pattern-matching>`_.
This can be controlled by the ``match_args`` argument to the class decorators on Python 3.10 and later.
On older versions, it is never added and the argument is ignored.