Jsonpickle

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* ``pyproject.toml`` was updated to include the ``project.license.text`` field so
that pypi continues to list our license.

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* ``pyproject.toml`` was updated to avoid specifying the license file.
This avoids breaking older setuptools versions while also avoiding
the deprecated ``tool.setuptools.license-files`` field.
``setuptools`` will find our ``LICENSE`` file automatically,
so there is no need to specify it.
(558)

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* Documentation warnings from ``furo`` have been fixed.
* Numpy datetime64 objects with nanosecond precision are now supported.
(+556) (555)

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* The unpickler is now more resilient to malformed "py/id" and "py/repr" data.
(+546)
* The unpickler is now more resilient to invalid "py/b85" and "py/b64" data.
(+547)
* The unpickler's support for read-only str attributes was improved.
(+548) (478)

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* The unpickler is now more resilient to malformed "py/reduce", "py/set",
"py/tuple", "py/b64", "py/b85", and "py/iterator" input data. (+544) (+545)
* The test suite was updated to leverage more pytest features.
* The ``jsonpickle.compat`` module is no longer used. It is still provided
for backwards compatibility but it may be removed in a future version.

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* **Breaking Change**: Python 3.7 is no longer supported.
* **Breaking Change**: Support for pre-0.7.0 ``repr``-serialized objects is no
longer enabled by default. The ``safe`` option to ``decode()`` was changed from
``False`` to ``True``. Users can still pass ``safe=False`` to ``decode()`` in order
to enable this feature for the purposes of loading older files, but beware that
this feature relies on unsafe behavior through its use of ``eval()``. Users are
encouraged to re-pickle old data in order to migrate away from the the unsafe loading
feature. (+514)
* The pickler no longer produces ``py/repr`` tags when pickling modules.
``py/mod`` is used instead, as it is clearer and uses one less byte. (+514)
* The test suite no longer uses the deprecated ``datetime.datetime.utcnow()``
function. (+539)