Django-meta

Features
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- Drop Python 2 (118)
- Drop Django<2.2 (118)
- Add Django 3.1 (118)
- Update tooling (118)
- Port to github-actions (118)
- Remove G+ support - Replace with Schema.org (108)
- Add support for image object (114)


Bugfixes
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- Switch request handling to thread locals (115)