Update setuptools to 33.1.0

[pyup-bot]

There's a new version of setuptools available.
You are currently using 32.3.1. I have updated it to 33.1.0

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

Changelog

33.1.0

---

Installation via pip, as indicated in the Python Packaging User's Guide <https://packaging.python.org/installing/>_,
is the officially-supported mechanism for installing
Setuptools, and this recommendation is now explicit in the
much more concise README.

Other edits and tweaks were made to the documentation. The
codebase is unchanged.

33.0.0

---

• 619: Removed support for the tag_svn_revision
  distribution option. If Subversion tagging support is
  still desired, consider adding the functionality to
  setuptools_svn in setuptools_svn 2.

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

Happy merging! 🤖

[coveralls]

Coverage remained the same at 100.0% when pulling f4c8a3a on pyup-update-setuptools-32.3.1-to-33.1.0 into 7aba87b on master.