Update chardet to 3.0.4

[pyup-bot]

There's a new version of chardet available.
You are currently using 3.0.3. I have updated it to 3.0.4

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

Changelog

3.0.4

This minor bugfix release just fixes some packaging and documentation issues:

• Fix issue with setup.py where pytest_runner was always being installed. (PR 119, thanks zmedico)
• Make sure test.py is included in the manifest (PR 118, thanks zmedico)
• Fix a bunch of old URLs in the README and other docs. (PRs 123 and 129, thanks qfan and jdufresne)
• Update documentation to no longer imply we test/support Python 3 versions before 3.3 (PR 130, thanks jdufresne)

Got merge conflicts? Close this PR and delete the branch. I'll create a new PR for you.

Happy merging! 🤖