Update setuptools to 34.0.0

[pyup-bot]

There's a new version of setuptools available.
You are currently using 33.1.1. I have updated it to 34.0.0

These links might come in handy: PyPI | Changelog | Repo

Changelog

34.0.0

---

• 581: Instead of vendoring the growing list of
  dependencies that Setuptools requires to function,
  Setuptools now requires these dependencies just like
  any other project. Unlike other projects, however,
  Setuptools cannot rely on setup_requires to
  demand the dependencies it needs to install because
  its own machinery would be necessary to pull those
  dependencies if not present (a bootstrapping problem).
  As a result, Setuptools no longer supports self upgrade or
  installation in the general case. Instead, users are
  directed to use pip to install and upgrade using the
  wheel distributions of setuptools.

Users are welcome to contrive other means to install
or upgrade Setuptools using other means, such as
pre-installing the Setuptools dependencies with pip
or a bespoke bootstrap tool, but such usage is not
recommended and is not supported.

Got merge conflicts? Close this PR and delete the branch. I'll create a new PR for you.

Happy merging! 🤖