* Bump up version to 2.0.0

* Update usage docs

* Update CHANGELOG

* Simplify black configuration to be closer to upstream defaults

Avoid extra configuration by simply going with Black defaults. This
allows removing some configuration options, thus simplifying the overall
configuration.

It also makes the code style closer to community conventions. As more
projects adopt black formatting, more code will look like the black
defaults.

Further, the default 88 tends to create more readable lines, IMO. The
black rationale is located at:
https://black.readthedocs.io/en/stable/the_black_code_style.html#line-length

* Update tests/test_api_jws.py

Co-authored-by: José Padilla <jpadilla@webapplicate.com>

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Update tests/test_api_jws.py

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Co-authored-by: José Padilla <jpadilla@webapplicate.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

- Fixed doctest which included incorrect output.
- Use intersphinx to allow linking to Python JSONEncoder class.
- Fix param types after previous str/bytes cleanups.
- Fix param syntax to avoid vertical bar.

The command `tox -e docs` now passes.

https://pre-commit.com/#updating-hooks-automatically

Since Python 3, these two functions are functionally equivalent, so use
the builtin one.

Update Python 2 syntax and drop Python-2-only examples.

Fix all Python console prompts to the full ">>> " for correct
highlighting.

Use "pycon" instead of "python" for interactive Python console session.
The "python" lexer is for Python scripts and doesn't interpret the ">>>"
prompt.

Fix all Python console code blocks to more accurately display what the
user will see. For example, when assigning a value to a variable, it
isn't also echoed.

Fix typo ".. code::" → ".. code-block::".

Use "console" instead of "sh" for shell sessions. The "sh" lexer is for
shell scripts. For a complete list of lexers, see:
https://pygments.org/docs/lexers/

Use blacken-docs to run black on code blocks. This is now included as a
pre-commit hook.

They were removed from the code in
f690976596bb74221f5a81fc9afffd5609bc4e70.

The CLI entry point was removed in commit
8a14f087c285bbe2f6e85ba4818e6c620b708d5d.

Upgrade black to version 20.8b1 and specify that Python 3.6+ syntax
should be used.

Run it on all files to upgrade syntax.