Update requests to 2.25.1

[pyup-bot]

This PR updates requests from 2.25.0 to 2.25.1.

Changelog

2.25.1

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

**Bugfixes**

- Requests now treats `application/json` as `utf8` by default. Resolving
inconsistencies between `r.text` and `r.json` output. (5673)

**Dependencies**

- Requests now supports chardet v4.x.

Links

• PyPI: https://pypi.org/project/requests
• Changelog: https://pyup.io/changelogs/requests/
• Docs: https://requests.readthedocs.io

[coveralls]

Coverage increased (+0.8%) to 86.426% when pulling 2258a63 on pyup-update-requests-2.25.0-to-2.25.1 into cede422 on master.