Email-validator

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* Deliverability checks now check for 'v=spf1 -all' SPF records as a way to reject more bad domains.
* Special use domain names now raise EmailSyntaxError instead of EmailUndeliverableError since they are performed even if check_deliverability is off.
* New module-level attributes are added to override the default values of the keyword arguments and the special-use domains list.
* The keyword arguments of the public methods are now marked as keyword-only, ending support for Python 2.x.
* [pyIsEmail](https://github.com/michaelherold/pyIsEmail)'s test cases are added to the tests.
* Recommend that check_deliverability be set to False for validation on login pages.
* Added an undocumented globally_deliverable option.

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* example.com/net/org are removed from the special-use reserved domain names list so that they do not raise exceptions if check_deliverability is off.
* Improved README.

Verison 1.2.0 (April 24, 2022)
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* Reject domains with NULL MX records (when deliverability checks
are turned on).
* Reject unsafe unicode characters. (Some of these checks you should
be doing on all of your user inputs already!)
* Reject most special-use reserved domain names with EmailUndeliverableError. A new `test_environment` option is added for using `*.test` domains.
* Improved safety of exception text by not repeating an unsafe input character in the message.
* Minor fixes in tests.
* Invoking the module as a standalone program now caches DNS queries.
* Improved README.

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* Allow passing a custom dns_resolver so that a DNS cache and a custom timeout can be set.

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* Fix invoking the module as a standalone program.
* Fix deprecation warning in Python 3.8.
* Code improvements.
* Improved README.

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* Fix exception when DNS queries time-out.
* Improved README.

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* The main function now returns an object with attributes rather than a dict with keys, but accessing the object in the old way is still supported.
* Added overall email address length checks.
* Minor tweak to regular expressions.
* Improved error messages.
* Added tests.
* Linted source code files; changed README to Markdown.