Dotwiz

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**Features and Improvements**

* Add helper function :func:`set_default_for_missing_keys <dotwiz.set_default_for_missing_keys>`,
which can be used to set a *default* value to return when an attribute (key) is missing.

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**Bugfixes**

* Update the implementations for :class:`DotWiz` and :class:`DotWizPlus` so that
we handle an edge case where we are presented with keys names that shadow
builtin ``dict`` methods, such as ``items`` or ``values``.

**Features and Improvements**

* Update :class:`DotWizPlus` to treat key names such as ``items``, ``get``, or
``to_dict`` as a reserved *keyword* for all intents and purposes, and add a
trailing ``_`` when storing the key name; this fixes attribute access (ex. like ``items_``)
and also resolves IDE warnings, which correctly state for ex. that builtin method ``items``
doesn't have an attribute named *x*.

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**Breaking Changes**

* Update the project classifier from *Production* to *Beta*, because the API is
not yet stable, and future minor releases might introduce other breaking changes.
* ``dotwiz`` has officially dropped support for Python 3.6. This is due to a
number of reasons, such as 3.6 reaching EOL some months back, and also
libraries such as ``pyheck`` which only support Python 3.7+.
* Update the :meth:`__repr__` for :class:`DotWiz` to display a star character (✫)
in place of the class name, just so it's a little easier to read.

**Features and Improvements**

* Add new :class:`DotWizPlus` class and implementation, which can be useful
for special-cased keys like ``myTestKey`` and ``hello, world!``. This implementation
mutates such keys to valid *snake case* identifier names, so the above key names
would become ``my_test_key`` and ``hello_world``.
* Add new dependency on `pyheck`_.
* Refactor to pull out common or shared code into a :mod:`common` module.
* Update the docs and add a section on :class:`DotWizPlus`.
* Update theme for the docs, from ``alabaster`` to ``furo``.
* Update tests to maintain 100% code coverage.

.. _pyheck: https://kevinheavey.github.io/pyheck

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**Breaking Changes**

* Removed :class:`DotWiz` methods :meth:`from_dict` and :meth:`from_kwargs`,
as these are now superseded by the :class:`DotWiz` constructor method.
* Update the signature of :func:`make_dot_wiz` to
``make_dot_wiz(*args, **kwargs)``

**Features and Improvements**

* It's now easier to create a :class:`DotWiz` object from a ``dict`` or from
*keyword* arguments. The :meth:`__init__` constructor method can now directly
be used instead.
* Add major performance improvements, so :class:`DotWiz` is now faster than ever.
* Add a :meth:`to_dict` method to enable a :class:`DotWiz` instance to be
recursively converted back to a ``dict``.
* Refactor code to remove unnecessary stuff.
* Add GitHub badges and CI integration for `codecov`.
* Updated docs.

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* First release on PyPI.