Update tqdm to 4.19.6

[pyup-bot]

There's a new version of tqdm available.
You are currently using 4.19.5. I have updated it to 4.19.6

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

Changelog

4.19.6

• CLI improvements
  • --bytes implies --unit B --unit_scale --unit_divisor 1024 (503)
  • allow hyphens in CLI arguments (511)
• synchronisation: fix for sem_open on aarch64 (513)
• framework update
  • CI/tests, year 2018, py37, badges, documentation

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 95.166% when pulling 326fa5d on pyup-update-tqdm-4.19.5-to-4.19.6 into e0805fe on master.