Pyramid-heroku

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* Supports bash style environment variable expansion.
e.g. to declare default value, use `${DATABASE_URL:-sqlite:///database.db}`
[sayanarijit]

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* Shell now prints stderr/stdout even on non-zero exit code.
[iElectric]

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* Fix auth bug in migrate.py.
[zupo]

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* Drop support for zc.buildout environments.
[zupo]

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* Expand all environment variables in the settings dictionary. This allows you
to have, for example `${DATABASE_URL}` to get db connection string from
environment into your `production.ini` file.
[zupo]

* Use pipenv for setting up development.
[zupo]

* Add basic type hinting.
[zupo]

* Drop support for Python versions older than 3.7.
[zupo]

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* Brown bag release.
[karantan]