Pyisemail

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- Fix the packaging to use the correct package name so that the wheel works as expected [`d36f22e`_] - `michaelherold`_.

.. _d36f22e: https://github.com/michaelherold/pyIsEmail/commit/d36f22eac615f29ffa62fe13161244c5e1f7e906

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- **Breaking (Python 2):** Upgrade to the new ``dnspython`` resolve API for DNS checks for future-proofing [`229db4f`_] - `moshfrid`_.
- **Breaking (Python 2):** Drop support for Python versions prior to 3.6 [`635aff4`_] - `michaelherold`_.
- Consider emails with domains that have null MX records, per RFC7505, invalid when checking DNS [`ebc4a2f`] - `bmcculley`_.

.. _229db4f: https://github.com/michaelherold/pyIsEmail/commit/229db4fe4f790b5a95e1e85bffbdd42464472ea5
.. _635aff4: https://github.com/michaelherold/pyIsEmail/commit/635aff42c3cd0a04f3bad8c79099cd5827fed74f
.. _ebc4a2f: https://github.com/michaelherold/pyIsEmail/commit/ebc4a2f8120b02d488472c1f5bf293b155b58118
.. _moshfrid: https://github.com/moshfrid
.. _bmcculley: https://github.com/bmcculley

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- Allow limiting of email addresses on Generic Top-Level Domains (gTLDs) with the ``allow_gtld=False`` option [`bf13a6c`_] - `michaelherold`_.

.. _bf13a6c: https://github.com/michaelherold/pyIsEmail/commit/bf13a6cfe662e66c8c6a5a9228d80cacf901b1ba

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- Upgrade to universal dnspython version - `peterdemin`_.

.. _peterdemin: https://github.com/peterdemin

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- Release as non-universal wheels because of the dnspython dependency.

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- Bugfix: Ensures that DNS checks fail context with or without
a diagnosis [`c7b91f6`_] - `michaelherold`_.
- The DNSValidator now fails checks when a query times out or fails to
return a response from any nameserver [`f8f4af7`_] - `michaelherold`_.

.. _c7b91f6: https://github.com/michaelherold/pyIsEmail/commit/c7b91f64b87b88a501628bb73cc6777b10e45ba5
.. _f8f4af7: https://github.com/michaelherold/pyIsEmail/commit/f8f4af7b4b2441c81a442f41b977ce8780f129a4