Update pdftotext to 2.2.1

[pyup-bot]

This PR updates pdftotext from 2.1.5 to 2.2.1.

Changelog

2.2.0

- Change the default layout behavior to match what poppler recommends
- Add an option to use physical layout mode, which matches the previous
default behavior

2.1.6

- Fix an issue with detecting the bounding box on some pages

Links

• PyPI: https://pypi.org/project/pdftotext
• Changelog: https://pyup.io/changelogs/pdftotext/
• Repo: https://github.com/jalan/pdftotext

[pyup-bot]

Closing this in favor of #134