Jaraco.collections

======

Packaging refresh.

Enrolled with Tidelift.

======

Fixed ``DictStack.__len__`` and addressed recursion error on
PyPy in ``__getitem__``.

======

``DictStack`` now supports the following Mapping behaviors:

- ``.items()``
- casting to a dict
- ``__contains__`` (i.e. "x in stack")

Require Python 3.7 or later.

======

Add ``WeightedLookup``.

======

Add ``FreezableDefaultDict``.

======

Rely on PEP 420 for namespace package.