Update bleach to 3.0.2

[pyup-bot]

This PR updates bleach from 3.0.1 to 3.0.2.

Changelog

3.0.2

----------------------------------

**Security fixes**

None

**Backwards incompatible changes**

None

**Features**

None

**Bug fixes**

* Merge ``Characters`` tokens after sanitizing them. This fixes issues in the
``LinkifyFilter`` where it was only linkifying parts of urls. (374)

Links

• PyPI: https://pypi.org/project/bleach
• Changelog: https://pyup.io/changelogs/bleach/
• Repo: https://github.com/mozilla/bleach
• Docs: https://pythonhosted.org/bleach/