Update email_validator to 2.1.1

[pyup-bot]

This PR updates email_validator from 2.0.0.post2 to 2.1.1.

Changelog

2.1.1

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

* Fixed typo 'marking' instead of 'marketing' in case-insensitive mailbox name list.
* When DNS-based deliverability checks fail, in some cases exceptions are now thrown with `raise ... from` for better nested exception tracking.
* Fixed tests to work when no local resolver can be configured.
* This project is now licensed under the Unlicense (instead of CC0).
* Minor improvements to tests.
* Minor improvements to code style.

2.1.0

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

* Python 3.8+ is now required (support for Python 3.7 was dropped).
* The old `email` field on the returned `ValidatedEmail` object, which in the previous version was superseded by `normalized`, will now raise a deprecation warning if used. See https://stackoverflow.com/q/879173 for strategies to suppress the DeprecationWarning.
* A `__version__` module attribute is added.
* The email address argument to validate_email is now marked as positional-only to better reflect the documented usage using the new Python 3.8 feature.

Links

• PyPI: https://pypi.org/project/email-validator
• Changelog: https://data.safetycli.com/changelogs/email-validator/
• Repo: https://github.com/JoshData/python-email-validator