-----------------------------
**Changes**
* Fix an example in ``README.rst`` that showed the old and no longer viable way to
get the client. New example reflects the current way.
* Purge older setuptools files ``setup.py`` and ``setup.cfg`` in favor of building
with ``flit``, using ``pyproject.toml``. Testing and dependencies here should install
properly with ``pip install -U '.[test]'``. After this, testing works with ``pytest``,
or ``pytest --cov=es_client --cov-report html:cov_html`` (``cov_html`` was added to
``.gitignore``). These changes appear to be necessary to build functional packages
for Python 3.11.
* Building now works with ``flit``. First ``pip install flit``, then ``flit build``.