Update textile to 4.0.2

[pyup-bot]

This PR updates textile from 3.0.4 to 4.0.2.

Changelog

4.0.2

- Bugfixes:
- Support non-http schemas in url refs (75)
-  pytest-runner is deprecated (77)
  -  other changes related to CI infrastructure

4.0.1

* Bugfixes:
* SyntaxWarnings with Python 3.8 (71)
* testsuite: internal error with coverage 5.0.X (72)
* DeprecationWarnings about invalid escape sequences (73)

4.0.0

* Drop support for Python 2, hence the version bump. Update list of PY3K versions to currently-supported versions. If you need to use textile on Python 2.7 or Python 3.3 or 3.4, please use textile Version 3.0.4.
* For use in PyPy environments, textile used to work well with the regex package. Lately, it's running into trouble. Please uninstall regex if this is the case for you.

Links

• PyPI: https://pypi.org/project/textile
• Changelog: https://pyup.io/changelogs/textile/
• Repo: http://github.com/textile/python-textile