Plaster-pastedeploy

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- Minor release to cleanup README.

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- Drop support for Python 2.7, 3.4, 3.5, 3.6.

- Add support for Python 3.8, 3.9, 3.10.

- Blackify the codebase.

- Switch CI to Github Actions.

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- Support Python 3.7.

- Depend on ``pastedeploy >= 2.0`` to enforce new behavior when overriding
defaults. Default values passed into the loader will now override values in
the ``[DEFAULT]`` section.
See https://github.com/Pylons/plaster_pastedeploy/pull/17

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- Change ``setup_logging`` to invoke ``logging.config.fileConfig`` with
``disable_existing_loggers=False`` to avoid disabling any loggers that were
imported prior to configuration of the logging system.
See https://github.com/Pylons/plaster_pastedeploy/pull/16

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- Removed environment variable support entirely for now. The feature requires
bugfixes upstream in PasteDeploy which have not been done yet and this was
breaking people's environments so it is gone for now.
See https://github.com/Pylons/plaster_pastedeploy/pull/15

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- Fix ``ConfigDict.copy`` so that it works.
See https://github.com/Pylons/plaster_pastedeploy/pull/14