Django-x509

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Features
~~~~~~~~

- Added ``validity_end`` to admin list of ``Ca`` and ``Cert``

Changes
~~~~~~~

- Removed test dependency on coveralls (it's defined in openwisp-utils)
- Reformatted code with the latest version of the black formatter

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Bugfixes
~~~~~~~~

- Fixed `bug in admin <https://github.com/openwisp/django-x509/issues/119>`_
for creating CA with blank ``key_length`` and ``digest`` fields

Changes
~~~~~~~

- Dropped support for Python ``3.6``
- Added support for Python ``3.8`` and ``3.9``
- Added support for Django ``3.2.x`` and ``4.0.x``
- Bumped ``cryptography~=36.0.0``
- Bumped ``pyopenssl~=21.0.0``

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- [fix] Fixed rendering of CA and cert edit pages when in popup mode
(`issue 113 <https://github.com/openwisp/django-x509/issues/113>`_)
- [fix] Fixed dependency version definition (minor fix)
- [deps] Set min cryptography version to 3.4, allow any higher 3.x
- [deps] Added support for Python ``3.8`` and ``3.9``

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- [deps] Updated pyopenssl range to allow 20.0.x
- [deps] Removed django-model-utils in favour of openwisp-utils
which centralizes several dependencies used by all the OpenWISP modules
(including ``django-model-utils``)

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- [deps] Pinned django-model-utils>=4.0.0,<4.1.0
- [deps] Pin cryptography to ~=3.2 because version 3.3
contains backward incompatible changes

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- [deps] Updated cryptography minimum version to 3.2 for security reasons
The version range has also been relaxed to avoid having to update it too often,
future versions up to but excluding 4.0 will be accepted
- [fix] Removed ``static()`` call from admin media
- [tests] Updated openwisp-utils[qa] to 0.7