Update dependency email_validator to v1.2.1

This MR contains the following updates:

Package	Type	Update	Change
email_validator	ironbank-pypi	patch	1.2.0 -> 1.2.1

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Release Notes

JoshData/python-email-validator

v1.2.1

Compare Source

Changes in version 1.2.0:

• Rejecting domains with NULL MX records (when deliverability checks are turned on).
• Rejecting unsafe unicode characters. (Some of these checks you should be doing on all of your user inputs already!)
• Rejecting most special-use reserved domain names. A new test_environment option is added for using @*.test domains.
• Some fixes in the tests.

In version 1.2.1:

• example and example.com/net/org are removed from the special-use domains list.
• SPECIAL_USE_DOMAIN_NAMES is now a documented part of the API (and it is a list instead of a tuple)
• New module-level attributes ALLOW_SMTPUTF8, CHECK_DELIVERABILITY, TEST_ENVIRONMENT, and DEFAULT_TIMEOUT can be used to change the default values of the keyword arguments.
• Travis CI is updated to test from Python 3.6 forward, dropping 3.5.

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