* Fixed a bug where deserialized objects with cache_hash=True could have
incorrect hash code values
* Add is_callable, deep_iterable, and deep_mapping validators.
* Fixed stub files to prevent errors raised by mypy's
disallow_any_generics = True option.
* Attributes with init=False now can follow after kw_only=True attributes.
* attrs now has first class support for defining exception classes.
* Clarified documentation for hashing to warn that hashable objects should
be deeply immutable
OBS-URL: https://build.opensuse.org/package/show/devel:languages:python/python-attrs?expand=0&rev=20