Pyramid-nacl-session

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- Add ``session_factory_from_settings`` and ``includeme``.
See https://github.com/Pylons/pyramid_nacl_session/pull/11

- Support the ``samesite`` option and default to ``Lax``.
See https://github.com/Pylons/pyramid_nacl_session/pull/14

- Drop Python 2.6, 3.3, and 3.4 support.

- Add Python 3.6, 3.7 and 3.8 support.

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- Drop Python 3.2 support.

- Drop the trailing padding (``=``) from base64 content.
See https://github.com/Pylons/pyramid_nacl_session/pull/7

- Add the ``EncryptedCookieSessionFactory`` as the primary API for using
an encrypted session.
See https://github.com/Pylons/pyramid_nacl_session/pull/6

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- Split the ``EncryptingPickleSerializer`` into ``EncryptedSerializer``
with a default dependency on ``pyramid.session.PickleSerializer`` allowing
alternative serializers to be used with the encryption interface.
See https://github.com/Pylons/pyramid_nacl_session/pull/4

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- Initial release.