- Change the `run` filter to be a function. Usage should be nicer now:
  `{{ run(['id', '-u'])['stdout'] }}`. Keep the filter for a few
releases to avoid breakage.
- A few filters were missing from the README, add the documentation.

Make it more explicit, set a release that will break backward
compatibility. Also, disable the proselint pre-commit hook, it can't
skip code blocks and there's not a lot I can do about that.

It did find a spelling error in the README. What an embarssment. Correct
that as well.

I don't know why, but the daily download count is down from 250+ to ~30.

A bunch of filters that just wrap objects from the netaddr library.

A quirk of GitHub, without a target the image causes a line break.

This reverts commit babd0599.

Allow installing just some of the dependencies. Some filters won't work,
but that's expected. Dcoument the change and keep all dependencies as
required for now to not cause unexpected breakage.

Useful information. I will admit I'm bragging a bit with the download
counter. I didn't believe it would have so many downloads (I'm really
excited).

Also:

- Update the README.
- Test more environments (every supported CPythong and PyPy version and
CPython 2.7).

- Use pipenv instead of tox.
- Expand use of pre-commit, many more hooks.
- Run just Bats and doctest for each Python version, pre-commit and
twine check just with Python 3.7.
- Fix doctests, issues found by different checks.
- Use bumpversion instead of relying on a VERSION file.
- Update documentation.
- State AGPL license everywhere (stated MIT in setup.py by accident).
- Format code with Black.
- Test on Python 3.7 in Travis CI.

- Replaced test shell script with Bats tests, update Travis CI and README
  accordingly.
- Removed unused pre-commit hooks.
- Bumped patch version.

- Added JMESPath support, updated docs, TODO list accordingly.
- Added docs to the locally run Tox environments (otherwise when I run
Tox locally this test won't be performed).

- Allow Python 3.2 to fail again (Jinja doesn't test on Python 3.2 so there may be no recurse but to remove testing on Python 3.2).

Unicode strings.
- Fixed combine filter tests.
- Updated TODO list accordingly.

- Updated TODO list.

- Bumped version to 0.3.0.

- Updated tests and documentation.
- Bumped version to 0.2.0.