Bump html2text from 2018.1.9 to 2020.1.16

Bumps [html2text](https://github.com/Alir3z4/html2text) from 2018.1.9 to 2020.1.16.
- [Release notes](https://github.com/Alir3z4/html2text/releases)
- [Changelog](https://github.com/Alir3z4/html2text/blob/master/ChangeLog.rst)
- [Commits](Alir3z4/html2text@2018.1.9...2020.1.16)

---
updated-dependencies:
- dependency-name: html2text
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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