- Python 3.4 is no longer supported.
- Introduced `cattr.typing` for use with Python versions 3.5.2 and 3.6.0.
- Minor changes to work with newer versions of `typing`.
- Bare Optionals are not supported any more (use `Optional[Any]`).
- Attempting to load unrecognized classes will result in a ValueError, and a helpful message to register a loads hook.
- Loading _attrs_ classes is now documented.
- The global converter is now documented.
- `cattr.loads_attrs_fromtuple` and `cattr.loads_attrs_fromdict` are now exposed.