* 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.

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

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

Run it on all files to upgrade syntax.

* Setup GH Actions

* Remove src path changes

* Add dev extras

* Update USING_COVERAGE

* last update

* Upgrade pytest

* Remove 2.7 things

Now successfully passes when running `tox -e lint`.

pyupgrade is a tool to automatically upgrade Python syntax for newer
versions of the language. Running pyupgrade removes several
Python-2-isms that are no longer necessary now that the project is
Python 3 only.

https://github.com/asottile/pyupgrade

* Setup pre-commit hooks

* Run initial `tox -e lint`

* Fix package name

* Fix .travis.yml