Update packaging to 17.0

[pyup-bot]

There's a new version of packaging available.
You are currently using 16.8. I have updated it to 17.0

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

Changelog

17.0

• Drop support for python 2.6, 3.2, and 3.3.

• Define minimal pyparsing version to 2.0.2 (:issue:91).

• Add epoch, release, pre, dev, and post attributes to
  Version and LegacyVersion (:issue:34).

• Add Version().is_devrelease and LegacyVersion().is_devrelease to
  make it easy to determine if a release is a development release.

• Add utils.canonicalize_version to canonicalize version strings or
  Version instances (:issue:121).

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

Happy merging! 🤖