Email-validator

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

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

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

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

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

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

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

* 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.

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

* Prevent resolving domain names as if they were not fully qualified using a local search domain settings.

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

* Added a timeout argument for DNS queries.
* The wheel distribution is now a universal wheel.
* Improved README.